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The Pandemic Showed We Totally CAN Limit Global Warming. Here's How

The Pandemic Showed We Totally CAN Limit Global Warming. Here’s How

With researchers warning that limiting global warming to 1.5 °C is fast slipping from our grasp, we know it will take a mammoth effort to reach. But the scale of emissions reductions required is actually something we have already achieved before – quite recently and rather by accident.   In 2020, global carbon dioxide (CO2) emissions fell by 6.3 percent or some 2,200 metric tons (MtCO2), a new…

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Stratospheric aerosol injection tactics and costs in the first 15 years of deployment 

Abstract We review the capabilities and costs of various lofting methods intended to deliver sulfates into the lower stratosphere. We lay out a future solar geoengineering deployment scenario of halving the increase in anthropogenic radiative forcing beginning 15 years hence, by deploying material to altitudes as high as ~20 km. After surveying an exhaustive list of potential deployment techniques, we settle upon an aircraft-based delivery system. Unlike the one prior comprehensive study on the topic (McClellan et al 2012 Environ. Res. Lett. 7 034019), we conclude that no existing aircraft design—even with extensive modifications—can reasonably fulfill this mission. However, we also conclude that developing a new, purpose-built high-altitude tanker with substantial payload capabilities would neither be technologically difficult nor prohibitively expensive. We calculate early-year costs of ~$1500 ton−1 of material deployed, resulting in average costs of ~$2.25 billion yr−1 over the first 15 years of deployment. We further calculate the number of flights at ~4000 in year one, linearly increasing by ~4000 yr−1. We conclude by arguing that, while cheap, such an aircraft-based program would unlikely be a secret, given the need for thousands of flights annually by airliner-sized aircraft operating from an international array of bases.

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It’s Getting Hot in Here: ‘Investment Funds Worth Trillions Are Dropping Fossil Fuel Stocks’

From The New York Times:

Investors controlling more than $5 trillion in assets have committed to dropping some or all fossil fuel stocks from their portfolios, according to a new report tracking the trend.

The report, released Monday, said the new total was twice the amount measured 15 months ago — a remarkable rise for a movement that began on American college campuses in 2011. Since then, divestment has expanded to the business world and institutional world, and includes large pension funds, insurers, financial institutions and religious organizations. It has also spread around the world, with 688 institutions and nearly 60,000 individuals in 76 countries divesting themselves of shares in at least some kinds of oil, gas and coal companies, according to the report.

“It’s a stunning number,” said Ellen Dorsey, the executive director of the Wallace Global Fund, which has promoted fossil fuel divestment and clean energy investment as part of its philanthropy.

The movement has also received a boost from last year’s Paris climate agreement, which set targets for reducing greenhouse gas emissions to avoid the worst effects of climate change. The push for emissions reductions underscored the potential for the industry to be faced with reserves of fuels that cannot be burned if the targets are to be met — a prospect known as “stranded assets.”

Ms. Dorsey argued that since its beginnings as a moral statement against profiting from companies whose products were exacerbating climate change, more institutions have come to detect vulnerabilities in fossil fuel companies as the world shifts toward renewable sources of energy.

Read the rest of the article here. 

(Photo: Steven Godfrey; Infographic: Carbon Tracker)

Related:

Average people can make a difference on global challenges (Phys.Org)

A beginner’s guide to fossil fuel divestment (The Guardian)

Canadian Medical Association completes divestment from fossil fuels (National Observer)

As fossil fuel diehards take over the White House, the evidence of a fast-moving global energy transition has never been clearer (Jeremy Leggett)

China is going all in on clean energy as the U.S. waffles (Forbes)

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