The New Map: Energy, Climate, and the Clash of Nations

by Daniel Yergin

Here is how the logic works, using average annual data from the years 2009–2018 (see Figure 1): Some 210 gigatons of carbon were annually, on average, naturally released by such processes as the decay of plants and breathing by people and animals. But 9.5 gigatons came from fossil fuels and 1.5 from land use. This added up to a total of 221 gigatons released. But only 215.7 were captured in the natural annual cycle—that is, absorbed by vegetation and the ocean—leaving a residual 4.9 gigatons in the atmosphere uncaptured. (There is also a budget imbalance factor.) That uncaptured 4.9 gigatons is only 2.2 percent of the naturally captured CO2. That may seem a very small amount in any given year. But, over the years, it accumulates and builds up in that band of gases known as earth’s atmosphere. Water vapor is the most prevalent greenhouse gas. Others include nitrous oxide and methane. Some of these gases dissipate after a year or ten years; others last much longer. Some are more potent than CO2.These greenhouse gases become a shield of sorts, a global “greenhouse” around the planet, retaining more of the sun’s heat, which otherwise would flow back into space. The result is greater warming for the earth—thus known as the “greenhouse effect.”7 As the climate consensus has crystallized, concern and fervor have risen, fueled by the fear that an approaching “tipping point” will lead to “runaway climate change.”