A new report outlines what the world would need to do to head off severe global warming:
Given what we know about the sensitivity of the climate to added greenhouse gases, it’s possible to calculate how much more carbon dioxide we can admit while still having a reasonable chance of staying within the two degree Celsius envelope. What’s striking about these calculations is how many large changes we’ll have to make in order to get there. According to Jeffrey Sachs of Columbia University’s Earth Institute, the per-capita emissions would have to drop from five tons annually (where they are now) to 1.6 tons by 2050.
To accomplish this, Sachs says that all nations will have to undergo a process he calls “deep decarbonization,” which is part of the title of a report he’s helped organize and deliver to the UN [earlier this week]. Pathways to Deep Decarbonization, prepared by researchers in 15 different countries, looks into what’s needed to achieve sufficient cuts in our carbon emissions. The report finds that current government pledges aren’t sufficient, and the technology we need to succeed may exist, but most of it hasn’t been proven to scale sufficiently.
Plumer looks at what Sachs’ plan would mean for the US:
The United States eventually gets 30 percent of its electricity from nuclear power and 40 percent of its electricity from renewable sources like hydro, wind, and solar by 2050. Electric vehicles would handle about 75 percent of all trips. Large trucks would get switched over to natural gas. The coal plants that remained would all capture their carbon-dioxide emissions and bury them underground. Every single building would adopt LEDs for lighting.
David Unger reads through the report’s recommendations:
The biggest need: research and early-stage development. The world underinvests in clean-energy research, development, and demonstration by roughly $70 billion a year, according to the Center for Clean Energy Innovation, a Washington-based organization that designs and advocates for clean-energy policy. That amounts to only 13 percent of what the world spends on global fossil-fuel subsidies, according to CCEI, and 27.5 percent of what it invests in deploying clean-energy technologies.
“The main lesson in history is that targeted R&D works,” says Sachs, who says clean energy needs a large public-private effort along the lines of the Manhattan Project or the push to put a man on the moon. “The remarkable fact is that we have not invested [enough] in an issue that is of existential importance to the planet.”
The Dish 