Peak Emissions Now – the US position

by | May 6, 2010 | Climate and resource scarcity, North America

In the run up to Copenhagen, I suggested the  economic downturn could be used to push for a goal of an immediate peak to global emissions.

In a pastiche of Kennedy’s man on the moon speech, I imagined President Obama laying down the following gauntlet to the world:

I believe that the world should commit itself to achieving the goal of stopping the inexorable rise in greenhouse gas emissions that is doing so much to put our planet in peril. I don’t believe we should aim to achieve this goal in 2020 or 2030 or 2050 – but right now in 2009, making this year the high water mark for mankind’s global experiment with the global climate.

Obviously this didn’t happen, but – gradually – we’re learning more about has happened to emissions. The figures for US carbon dioxide  for 2009 are now in and the good news is that they fell by an astonishing 9%.

Question is: has the US stimulus been wisely spent on measures that will push the economy onto a lower carbon path as it grows again? The answer is probably not, though there is some reason for hope:

As the economy recovers, the structure of that recovery will be important to the future emissions profile of the United States.  If energy-intensive industries lead the economic recovery, emissions would increase faster than if service industries or light manufacturing play the leading role.   If coal, which was more heavily impacted by the recent economic downturn than other energy sources, rebounds disproportionately, the carbon intensity of the energy supply could rise above the 2009 level.

However, longer-term trends continue to suggest decline in both the amount of energy used per unit of economic output and the carbon intensity of our energy supply, which both work to restrain emissions.

The world is at a major inflection point on its carbon trajectory, but I fear we’re going to blunder through it without realising the opportunity for transformation. As Copenhagen showed, unfortunately, we’re still a long, long way from reframing climate change as a now problem. But it’s still not too late to start working for peak emissions.

Nuclear winter redux

by | Mar 23, 2010 | Conflict and security

Mushroom Cloud Blues

Ever wondered what a nuclear strike would do to the environment?

The detonation of 100 15-kiloton nuclear weapons in Indian and Pakistani megacities would create urban firestorms that would loft 5 million tons of thick, black smoke above cloud level. (This smoke would engulf the entire planet within 10 days.)

Because the smoke couldn’t be rained out, it would remain in the stratosphere for at least a decade and have profoundly disruptive effects. Specifically, the smoke layer would block sunlight, heat the upper atmosphere, and cause massive destruction of protective stratospheric ozone.

A 2008 study PDF calculated ozone losses (after the described conflict) of 25-45 percent above mid-latitudes and 50-70 percent above northern high latitudes persisting for five years, with substantial losses continuing for another five years. Such severe ozone depletion would allow intense levels of harmful ultraviolet light to reach Earth’s surface–even with the stratospheric smoke layer in place.

Beneath the smoke, the loss of warming sunlight would produce average surface temperatures colder than any experienced in the last 1,000 years. There would be a corresponding shortening of growing seasons by up to 30 days and significant reductions in average rainfall in many areas, with a 40-percent decrease of precipitation in the Asian monsoon region.

Basically, the Earth’s surface would become cold, dark, and dry.

Via @jduncanMACD – the UK’s tweeting Ambassador for Multilateral Arms Control and Disarmament.