This week Nicholas Stern, the British top climate economist and academic who is probably most known for the Stern Review, endorsed 350 ppm as “a very sensible long-term target.”

350 ppm, as in parts per million, the level scientists have identified as the safe upper limit for CO2 in our atmosphere. We are currently at 390 ppm and, according to the science, we need to get back to 350 ppm as soon as possible to be able avoid runaway climate change.

In an interview with a German newspaper Stern endorsed the 350 ppm target saying he “think it’s a very sensible long-term target.” Bill McKibben, environmental writer and founder of 350.org, writes:

“I think it’s a very sensible long-term target.” He went on to explain: “People have to be aware that is a truly long-term target. We have already passed 350ppm, we are at 390 ppm of Co2 and at 435 ppm of Co2-equivalents right now. It is most important to stop the increase of flows of emissions short term and then start the decline of flows of annual emissions and get them down to levels which will move concentrations of CO2 back down towards 350ppm.

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George Monbiot, Europe’s leading green commentator, says it’s all over. But argues we can’t afford to abandon our efforts to cut emissions. Because if we do “our prophecy is bound to come true”.

“Quietly in public, loudly in private, climate scientists everywhere are saying the same thing: it’s over. The years in which more than 2C of global warming could have been prevented have passed, the opportunities squandered by denial and delay. On current trajectories we’ll be lucky to get away with 4C. Mitigation (limiting greenhouse gas pollution) has failed; now we must adapt to what nature sends our way. If we can.”

Read this important piece on the Guardian!

Lord Nicholas Stern, British economist and academic who is most known for the Stern Review said, during an improvised speech at a Cape Town hotel in South Africa, that if we don’t act quickly and determinedly to address climate change the world will face billions of climate refugees and extended world wars in a near future:

“If the world’s nations act responsibly, Stern said, they will achieve “zero-carbon” electricity production and zero-carbon road transport by 2050 _ by replacing coal power plants with wind, solar or other energy sources that emit no carbon dioxide, and fossil fuel-burning vehicles with cars running on electric or other “clean” energy.

Then warming could be contained to a 2-degree-Celsius (3.4-degree-Fahrenheit) rise this century, he said.

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“Emissions are growing much faster than we’d thought, the absorptive capacity of the planet is less than we’d thought, the risks of greenhouse gases are potentially bigger than more cautious estimates and the speed of climate change seems to be faster.”

“People who said I was scaremongering were profoundly wrong.”

Lord Stern of Brentford have realised, just like many other scientists are beginning to do, that the predictions in the IPCC reports have been too soft and that climate change will be “stronger than expected and sooner than expected.”

Stern is known for the Stern Review that showed it would be much cheaper to act on climate change than doing nothing.