Introduction
You often feel overwhelmed by climate anxiety and confused about how your daily choices impact the planet. Hope Jahren investigates how human survival links directly to planetary degradation through a combination of personal observation and hard data.
Humanity's exponential surge in consumption and population has drastically altered the planet's ecosystems and climate, making per capita energy conservation and sharing our ultimate twenty-first-century challenge.
The book traces this crisis across several distinct domains. You will first examine your own consumption habits compared to global averages. The text then details the massive post-war expansion of population, agriculture, and food production. Finally, you will explore the mechanics of fossil fuel reliance, industrial manufacturing, and the resulting atmospheric changes.
The book answers critical questions about your daily impact:
- How much do your personal habits contribute to global resource depletion?
- In what ways does modern agriculture alter natural ecosystems?
- Why do fossil fuels remain so difficult to replace despite climate risks?
1. Taking Personal Action
You can systematically enact meaningful environmental protection. The approach moves from personal self-reflection to habit modification, financial choices, and institutional lobbying.
Individuals can systematically enact meaningful environmental protection by examining personal values, auditing resource habits, adjusting daily activities, aligning investments, and advocating within institutions.
Buying a cappuccino on the run is an investment. You fund the cafe location, employee treatment, bean sourcing, dairy cow living conditions, and transport systems.
The Five Steps of Personal Action
- Step 1: Examine your values and rank the issues that resonate with your daily life, then identify one issue to focus upon.
- Step 2: Gather information by auditing your habits, possessions, driving miles, plane trips, water waste, food waste, meat consumption, clothing tags, and refrigerator items.
- Step 3: Make your personal activities consistent with your values by picking out one change such as driving less, carpooling, flying less, using public transit, buying 40 percent less food, or avoiding sugared foods.
- Step 4: Make your personal investments consistent with your values by evaluating stocks, bonds, mutual funds, and daily commercial purchases.
- Step 5: Move your institutions toward consistency with your values by starting dialogues at your school, house of worship, or place of employment.
2. The Difference You Make
Citizens of the Organisation for Economic Co-operation and Development, and particularly the United States, act as the world's largest consumer lever through disproportionate energy, electricity, and resource usage.
The Organisation for Economic Co-operation and Development contains 1.3 billion people. This group represents one-sixth of the global population. These citizens consume one-third of the world's total energy, electricity, carbon dioxide emissions, meat, and sugar.
The United States represents one-quarter of the total population within the Organisation for Economic Co-operation and Development. Yet the United States accounts for only 4 percent of the entire world population.
The United States uses half of the Organisation for Economic Co-operation and Development total energy and one-third of its electricity. American citizens also eat one-third of the total meat and one-quarter of the total sugar consumed across the entire Organisation for Economic Co-operation and Development.
Household Electricity Levers
Average modern electricity use in the Organisation for Economic Co-operation and Development reaches ten megawatts per hour per year. Hot water typically uses half of home electricity. Space heaters and air-conditioning units consume one dollar out of every three on the electric bill. An air conditioner requires double the extra electricity compared to a space heater to achieve the same temperature change. Small space-altering appliances like dryers, stoves, and refrigerators use 15 percent of total home electricity. Managing heating and cooling achieves a 60 percent total reduction in electricity use. Combining all major and minor conservation steps yields a 70 percent total reduction in home electricity use.
You can lower your energy use by targeting the biggest electrical appliances in your home.
- Check appliance EPREL stickers or kWh/annum indices to choose energy-efficient models.
- Change from a fifty-gallon water heater to a twenty-gallon model.
- Use cooler or cold water while washing clothes, rinsing dishes, and taking showers.
- Tolerate a decrease in room temperature during the cold season and an increase during the warm season.
- Go without A/C for more days of the year and turn heat down during winter.
- Use machines that heat or cool small spaces (clothes dryer, stove, dishwasher, refrigerator) less often or at different temperatures.
- Vacuum your house once a month instead of once a week.
3. A Summary of Facts
Over the last half-century, global human population, food production, energy consumption, and transportation metrics have experienced massive, unprecedented multi-fold increases.
Data compiled from international databases show striking trends. As the human population doubled, production of grains, meat, and seafood tripled. Energy and electricity usage skyrocketed alongside the number of motor vehicles and airline passengers.
Historical Population and Urbanization
Historical population growth has consistently occurred in doubling cycles. Figures from ancient Mesopotamia, classical Greece, medieval Europe, and the industrial era show that human population repeatedly doubled every few centuries.
In 1800 BC, the world population reached near one hundred million. During the era of Aristotle, the total reached 250 million. The world population during the High Middle Ages was one-half billion.
When Thomas Robert Malthus published his essay in 1798, the world population stood at one billion. Malthus argued that food production improvements would only trigger population increases and permanent want. The population then reached 1.5 billion around 1848, 3.5 billion in 1969, and seven billion today.
Drastic improvements in childhood survival rates, maternal safety, and life expectancy over the past two centuries coincided with a massive global shift toward urban living. Modern sanitation, clean water, and access to medical care transformed survival rates.
- Two out of five children born in 1819 died before their fifth birthday.
- One out of twenty-five babies today die before turning five.
- Women give birth an average of three times globally today, down from six in the past.
- One out of every hundred U.S. live births a century ago resulted in a dead mother.
- The current U.S. maternal death rate is one out of ten thousand per live births.
Life expectancy rose from fifty-eight years for a newborn American child in 1923 to seventy-one years when the author was born in 1969. American life expectancy for a child born in 2004 reached seventy-eight years.
Only 3 percent of the global population lived in any kind of city in 1817. Half of the global population currently resides in cities of at least one hundred thousand people. Forty-seven cities have grown to contain more than ten million people.
The author highlights that since 1969, the number of airline passengers has increased tenfold, while the number of motor vehicles on the planet has reached almost one billion.
4. Food, Agriculture, and Diet
Agricultural yields, intensive animal farming, aquaculture, and convenient processed foods have surged dramatically, creating massive resource demands and food waste crises.
Global crop yields have tripled over the last fifty years without a significant increase in the amount of farmed land. Farmers produce three billion tons of cereal annually today compared to one billion tons in 1969 on roughly the same land area.
Fifty years ago, a plot of land the size of a basketball court was required to produce one bushel of corn, whereas today only two parking spaces are needed.
Growing Grain and Raising Meat
Modern crops are genetically distinct from their ancestors due to decades of breeding, hybridization, and direct DNA modification. Today, 10 percent of the world's croplands are planted with GMO crops, and almost all soybeans, corn, cotton, and canola in the United States are GMO varieties.
The vast majority of the grain grown in the American heartland is fed to livestock rather than consumed directly by humans. More than sixty billion bushels of grain are fed to meat animals globally every year, where six pounds of feed results in only one pound of harvested meat.
Global meat and animal product production has tripled over the past fifty years through intensive biology manipulation, specialized slaughter facilities, and heavy resource inputs. This meat industry consumes 30 percent of human fresh water and two-thirds of U.S. antibiotics.
A Ukrainian journalist was shown a single steer being raised for a local wedding, highlighting the contrast with American industrial scale where one million animals are slaughtered every hour.
Modest reductions in red meat and poultry consumption in wealthy nations could dramatically expand the global food-grain supply.
- Cut red meat and poultry intake down to two pounds per week per person.
- Adopt the habit of one meatless day per week across industrialized nations.
Finding Fish and Making Sugar
Aquaculture has replaced ocean fishing as the primary source of seafood, but it mirrors industrial land farming's resource demands. Raising carnivorous farmed fish requires grinding up fifteen pounds of ocean-caught small fish for every pound of salmon produced.
Brothers Ove and Sivert Grøntvedt placed twenty thousand baby salmon into a net near Hitra, Norway, in 1969, proving the profitability and viability of cage-raised fish.
The massive expansion of aquaculture enabled explosive growth in seaweed harvesting, yielding thickening agents utilized throughout processed foods. Nori has become globally recognized as the shiny dark ribbon holding sushi together following the aquaculture boom.
The rise of convenience foods and the invention of high-fructose corn syrup caused a massive, unprecedented spike in human sugar consumption. Sugary beverages and processed convenience foods now account for a major share of daily caloric intake.
Throwing It All Away
A significant portion of all agricultural production, processed goods, and human labor is discarded directly into landfills as waste. In the United States, 20 percent of food sent to landfills is perfectly edible, and one out of every seven truckloads of fresh food delivered to supermarkets is thrown away.
The author reflects on Saint Paul, Minnesota's sewer systems and urban waste infrastructure to illustrate how human biological waste scales directly with rising food intake.
5. Energy, Fossil Fuels, and Manufacturing
Modern civilization relies heavily on nonrenewable fossil fuels and petroleum-derived plastics while struggling with the limitations of biofuels and renewable energy alternatives.
Global Energy Inequality
Energy consumption and economic value are profoundly imbalanced globally, with wealthy nations consuming a disproportionate share while a billion people lack electricity. Americans make up 4 percent of the population but consume 15 percent of the world's energy and 20 percent of its electricity. Meanwhile, one billion people in sub-Saharan Africa produce only 2 percent of the world's value and suffer from severe energy, clean water, and sanitation poverty.
Global suffering and resource scarcity arise not from the earth's inability to produce, but from humanity's inability to share and curb consumption. If all global fuel and electricity were redistributed equally, each person's usage would match the average consumption in Switzerland during the 1960s. Curbing consumption is presented as the ultimate trial of the twenty-first century.
Transportation and Fossil Fuel Origins
Automobiles and airplanes are vastly resource-intensive modes of travel that drive continuous increases in oil dependence and driving mileage. The average car and airplane consume huge amounts of fuel compared to public transit or trains. Despite efficiency gains from the 1970s oil crises, Americans and other nations offset these gains by building heavier vehicles and driving vastly greater distances.
If two hundred passengers left a Newark flight and drove in individual cars, they would burn 40 percent less fuel than the plane, but a passenger train would use 50 percent less fuel than the plane. The world currently supports 1 billion passenger vehicles, while the average airplane achieves 400 feet to the gallon and the average American car achieves 30 miles to the gallon.
Coal, oil, and natural gas are the nonrenewable, pressed and cooked remains of ancient plants and animals from prehistoric ecosystems. Fossil fuels originate from specific ancient sites such as the Forest of Ruhr, the Tethys Ocean, and the Panthalassa Sea. Proven reserves offer a limited supply at current consumption rates, with oil and natural gas lasting about fifty years and coal lasting about 150 years.
The largest coal reserve in western Europe was once a tropical forest, and the oil of Saudi Arabia once lined a shallow ocean. Out of all burned fossil fuel, 40 percent is oil, 30 percent is coal, and 30 percent is natural gas.
Plastics, Biofuels, and Renewable Realities
Converting edible agriculture into biofuels is highly resource-inefficient and fails to replace fossil fuel dependency while threatening food supplies. Biofuels are made by processing crops like corn and sugarcane into ethanol, but producing them requires heavy fossil fuel use for farm machinery and chemicals. They cannot replace oil at current consumption levels and divert a massive share of global grain away from starving people.
If the United States relied 100 percent on biofuels, current annual production would last about six days. Producing biofuel requires 20 pounds of sugarcane to make 1 pound of fuel, while 20 percent of grain grown on planet Earth is converted to biofuel.
Plastics are a major manufacturing miracle derived from petroleum feedstock, deeply embedding oil into everyday objects and disposable packaging. Refined crude oil yields petrochemical feedstock used to manufacture numerous synthetic polymers. Plastic has replaced glass, metal, paper, and cotton, but over 90 percent of discarded plastic ends up in landfills or oceans.
Students examining their backpacks or purses routinely find between twenty and fifty plastic items. Global plastic production reaches 300 million metric tons per year, consuming 10 percent of all fossil fuel burned on Earth.
While renewable energy sources like wind, solar, and hydro are growing, they currently provide only a tiny fraction of global energy and cannot easily sustain modern consumption levels. Wind and solar power combined provide less than 5 percent of the world's electricity. Transitioning completely to renewables would require staggering land areas and massive mining operations for metals like lithium and copper, which are concentrated in historically poor countries like Chile and Peru.
Powering America using only solar energy would require sacrificing a land area the size of South Carolina to solar panels. Hydroelectric plants generate 18 percent of world electricity, while wind provides less than 4 percent, solar provides less than 1 percent, and nuclear power plants generate 19 percent of US electricity.
6. Altered Air and Climate Realities
Carbon dioxide molecules absorb sunlight and trap heat, which raises average global surface temperatures. This creates larger temperature contrasts between warm and cold air pockets and speeds up oceanic evaporation, intensifying hurricanes, snowstorms, droughts, and downpours.
Rising carbon dioxide levels trap solar energy and increase global surface temperatures, driving more extreme weather and global weirding.
The author notes that 1977 to 1979 marked the coldest winter temperatures in the twentieth century US, whereas Minnesota winters have since become much warmer with a snow-cover season shortened by two full weeks compared to 1972. Average global surface temperatures increased by 1.5 degrees Fahrenheit over the last 100 years, with a 1 degree Fahrenheit warming trend during the last 30 years. The period from 2005 to 2016 was the warmest decade on record since the invention of the thermometer.
International climate accords have consistently failed because they rely on non-binding aspirations rather than enforceable reductions in fossil fuel use. The United Nations Framework Convention on Climate Change led to the Kyoto Protocol in 1998 and the Paris Agreement in 2015. Countries set voluntary targets or emission caps, but emissions continued to rise because economic cycles favor profit over resource reduction and agreements lack enforcement mechanisms.
The 1995 UNFCCC involved over 150 countries, and the 2015 Paris Agreement was signed by 175 countries, yet carbon dioxide emissions continued to increase and 2016 became the hottest year on record with a net warming limit targeted by the Paris Agreement set at 2 degrees Celsius.
Warming Weather and Melting Ice
Global temperature increases are rapidly melting the world's snowpacks, glaciers, and sea ice. Higher temperatures delay the date of winter refreezing and extend the summer melting season, destroying sea ice and drastically shrinking mountain snowpacks across North America and Europe.
The author named a heavy piece of ice Covington in 1976 and kicked it home from school every day until it melted by spring. In Glacier National Park, all glaciers are on track to disappear within our generation. There are 23 sites that have hosted the Winter Olympic Games since 1926, and almost half of them can no longer accommodate snow conditions, while Colorado has lost 80 percent of its snowpack in some areas since 1930.
Global sea levels are rising due to melting land ice and the thermal expansion of warming ocean waters, while ocean acidification damages marine life. Oceans have absorbed most greenhouse warming heat, causing seawater to expand and raise sea levels by an average of 7 inches since 1880. Oceans also absorb about one-third of emitted carbon dioxide, which reacts with water to form an acid that harms coral reefs and shelled marine animals alongside a 1 degree Fahrenheit warming of ocean surface waters over the last 50 years.
The East Coast of the United States has lost twenty square miles of land to the open ocean just since 1996, and Bangladesh faces a 20 percent shrinkage of its land area over the next thirty years.
Rising Waters and Mass Extinctions
Widespread habitat loss and climate change are driving species declines that threaten to trigger a sixth mass extinction. Human development has eliminated huge percentages of natural habitats like forests, coral reefs, and prairies, leaving native species with shrinking niches while current extinction rates are vastly higher than the historical background rate found in fossils.
At the PUCRS Ichthyology Lab in Porto Alegre, Brazil, researchers document freshwater fish species and discovered new ones at an average rate of once every four days before they go extinct. Freshwater habitats make up 1 percent of Earth's surface and contain at least 6 percent of our planet's species, while North and South America have lost 88 percent of tropical forests since the arrival of Europeans. The current global species extinction rate is 1,000 times higher compared to the background rate in rocks of the past, and one-quarter of today's species will be lost by 2050 if current rates continue.
Proposed technological fixes for climate change often consume more energy than they offset or carry immense ecological risks. Methods such as carbon capture and storage, rock weathering enhancement, tree planting, ocean fertilization, and solar radiation management via sunshades or aerosols are either too slow, energetically unprofitable, or dangerously disruptive to global weather patterns. Volcanic eruptions like Mount Pinatubo in 1991 sprayed aerosol particles high above the clouds and cooled parts of the planet by almost one degree Fahrenheit for two years, demonstrating the cooling effect of haze. World-class construction projects like the Three Gorges Dam commonly cost between 20 to 30 billion dollars.
Massive per capita energy conservation is the most direct and lowest-effort lever to bring humanity back into a sustainable future.
If high-consuming nations reduced their energy use to the level of Switzerland in the 1960s, global energy use and carbon emissions would immediately plummet by at least 20 percent without sacrificing basic life expectancy or health. Only 13 percent of Earth's land area is currently under some degree of legal protection.
- Identify the most energy-intensive thing you do in your daily life.
- Determine if you are willing to change your consumption habits.
10 Key Ideas
- Humanity's exponential surge in consumption and population has drastically altered the planet's ecosystems and climate, making per capita energy conservation and sharing our ultimate twenty-first-century challenge.
- Citizens of the Organisation for Economic Co-operation and Development, and particularly the United States, act as the world's largest consumer lever through disproportionate energy, electricity, and resource usage.
- Over the last half-century, global human population, food production, energy consumption, and transportation metrics have experienced massive, unprecedented multi-fold increases.
- Agricultural yields, intensive animal farming, aquaculture, and convenient processed foods have surged dramatically, creating massive resource demands and food waste crises.
- Modern civilization relies heavily on nonrenewable fossil fuels and petroleum-derived plastics while struggling with the limitations of biofuels and renewable energy alternatives.
- Rising carbon dioxide levels trap solar energy and increase global surface temperatures, driving more extreme weather and global weirding.
- Individuals can systematically enact meaningful environmental protection by examining personal values, auditing resource habits, adjusting daily activities, aligning investments, and advocating within institutions.
- Managing heating and cooling achieves a sixty percent total reduction in electricity use while lowering the biggest home electrical appliances.
- Modest reductions in red meat and poultry consumption in wealthy nations could dramatically expand the global food-grain supply.
- Massive per capita energy conservation is the most direct and lowest-effort lever to bring humanity back into a sustainable future.