Game Over for the Climate


Dito puntato contro l’intenzione canadese di estrarre petrolio dalle sabbie bituminose. Il riscaldamento globale è il segnale più forte dei cambiamenti che già sono in atto La concentrazione di ossido di carbonio nell’atmosfera si è innalzata di 280 parti per milione negli ultimi 150 anni. Le sabbie bituminose contengono concentrazioni di non meno di 500 parti per milione

James Hansen, direttore del Nasa Goddard Institute for Space Studies, ha scritto un articolo per il «New York Times», particolarmente allarmante a proposito dei cambiamenti climatici e delle intenzioni del Canada di estrarre petrolio dalle sabbie bituminose. Su questo il nostro governo, recentemente, in sede europea, è stato molto carente.

Hansen è un’autorità nel campo, lanciò l’allarme sui cambiamenti climatici con un articolo su «Science» già nel 1981 e successivamente, nel 1988, davanti al Congresso Usa.

«Se il Canada va avanti e noi non facciamo nulla, sarà “game over” per il clima». Così inizia il suo articolo pieno di riferimenti e dati.

Le sabbie bituminose, infatti, contengono il doppio della quantità di ossido di carbonio emessa dal petrolio che usiamo dall’inizio della nostra era, 2,5 milioni di anni fa, ad oggi. Il loro uso porterebbe a conseguenze apocalittiche: disintegrazione incontrollata dei ghiacciai, innalzamento intollerabile della temperatura, distruzione delle città costiere, estinzione del 20-50 % delle specie viventi… compresa la nostra.

Questo a lungo termine, sottolinea Hansen, ma a breve termine le cose non sarebbero migliori: nel giro di pochi decenni le regioni occidentali degli Usa diventerebbero semi aride con una siccità permanente, le perdite economiche sarebbero incalcolabili e i prezzi dei generi alimentari salirebbero alle stelle.

Il riscaldamento globale è il segnale più forte dei cambiamenti che già sono in atto (estati più calde perfino in Russia che hanno causato migliaia di morti, vedi 2003 in Europa, non sono eventi naturali!).

La concentrazione di ossido di carbonio nell’atmosfera si è innalzata di 280 parti per milione negli ultimi 150 anni. Le sabbie bituminose contengono concentrazioni di non meno di 500 parti per milione.

Dobbiamo trovare il modo, auspica Hansen, di ridurre in modo significativo le emissioni, non di aumentarle. Il presidente Obama parla di «pianeta in pericolo» ma non spinge la leadership a cambiare. La situazione scientifica è chiara: è tempo che la politica ne prenda atto. Più aspettiamo più i costi diventeranno alti e «non possiamo aspettare ed essere giudicati immorali dalle generazioni future».

Ecco il testo dell’articolo

Game Over for the Climate

GLOBAL warming isn’t a prediction. It is happening. That is why I was so troubled to read a recent interview with President Obama in Rolling Stone in which he said that Canada would exploit the oil in its vast tar sands reserves “regardless of what we do”.

If Canada proceeds, and we do nothing, it will be game over for the climate.

Canada’s tar sands, deposits of sand saturated with bitumen, contain twice the amount of carbon dioxide emitted by global oil use in our entire history. If we were to fully exploit this new oil source, and continue to burn our conventional oil, gas and coal supplies, concentrations of carbon dioxide in the atmosphere eventually would reach levels higher than in the Pliocene era, more than 2.5 million years ago, when sea level was at least 50 feet higher than it is now. That level of heat-trapping gases would assure that the disintegration of the ice sheets would accelerate out of control. Sea levels would rise and destroy coastal cities. Global temperatures would become intolerable. Twenty to 50 percent of the planet’s species would be driven to extinction. Civilization would be at risk.

That is the long-term outlook. But near-term, things will be bad enough. Over the next several decades, the Western United States and the semi-arid region from North Dakota to Texas will develop semi-permanent drought, with rain, when it does come, occurring in extreme events with heavy flooding. Economic losses would be incalculable. More and more of the Midwest would be a dust bowl. California’s Central Valley could no longer be irrigated. Food prices would rise to unprecedented levels.

If this sounds apocalyptic, it is. This is why we need to reduce emissions dramatically. President Obama has the power not only to deny tar sands oil additional access to Gulf Coast refining, which Canada desires in part for export markets, but also to encourage economic incentives to leave tar sands and other dirty fuels in the ground.

The global warming signal is now louder than the noise of random weather, as I predicted would happen by now in the journal Science in 1981. Extremely hot summers have increased noticeably. We can say with high confidence that the recent heat waves in Texas and Russia, and the one in Europe in 2003, which killed tens of thousands, were not natural events – they were caused by human-induced climate change.

We have known since the 1800s that carbon dioxide traps heat in the atmosphere. The right amount keeps the climate conducive to human life. But add too much, as we are doing now, and temperatures will inevitably rise too high. This is not the result of natural variability, as some argue. The earth is currently in the part of its long-term orbit cycle where temperatures would normally be cooling. But they are rising – and it’s because we are forcing them higher with fossil fuel emissions.

The concentration of carbon dioxide in the atmosphere has risen from 280 parts per million to 393 p.p.m. over the last 150 years. The tar sands contain enough carbon – 240 gigatons – to add 120 p.p.m. Tar shale, a close cousin of tar sands found mainly in the United States, contains at least an additional 300 gigatons of carbon. If we turn to these dirtiest of fuels, instead of finding ways to phase out our addiction to fossil fuels, there is no hope of keeping carbon concentrations below 500 p.p.m. – a level that would, as earth’s history shows, leave our children a climate system that is out of their control.

We need to start reducing emissions significantly, not create new ways to increase them. We should impose a gradually rising carbon fee, collected from fossil fuel companies, then distribute 100 percent of the collections to all Americans on a per-capita basis every month. The government would not get a penny. This market-based approach would stimulate innovation, jobs and economic growth, avoid enlarging government or having it pick winners or losers. Most Americans, except the heaviest energy users, would get more back than they paid in increased prices. Not only that, the reduction in oil use resulting from the carbon price would be nearly six times as great as the oil supply from the proposed pipeline from Canada, rendering the pipeline superfluous, according to economic models driven by a slowly rising carbon price.

But instead of placing a rising fee on carbon emissions to make fossil fuels pay their true costs, leveling the energy playing field, the world’s governments are forcing the public to subsidize fossil fuels with hundreds of billions of dollars per year. This encourages a frantic stampede to extract every fossil fuel through mountaintop removal, longwall mining, hydraulic fracturing, tar sands and tar shale extraction, and deep ocean and Arctic drilling.

President Obama speaks of a “planet in peril,” but he does not provide the leadership needed to change the world’s course. Our leaders must speak candidly to the public – which yearns for open, honest discussion – explaining that our continued technological leadership and economic well-being demand a reasoned change of our energy course. History has shown that the American public can rise to the challenge, but leadership is essential.

The science of the situation is clear – it’s time for the politics to follow. This is a plan that can unify conservatives and liberals, environmentalists and business. Every major national science academy in the world has reported that global warming is real, caused mostly by humans, and requires urgent action. The cost of acting goes far higher the longer we wait – we can’t wait any longer to avoid the worst and be judged immoral by coming generations.

James Hansen directs the NASA Goddard Institute for Space Studies and is the author of “Storms of My Grandchildren”.