D'un tratto nel folto bosco

Non c’era nessuno in tutto il paese che potesse insegnare ai bambini che la realtà non è soltanto quello che l’occhio vede e l’orecchio ode e la mano può toccare, bensì anche quel che sta nascosto alla vista e al tatto, e si svela ogni tanto, solo per un momento, a chi lo cerca con gli occhi della mente e a chi sa ascoltare e udire con le orecchie dell’animo e toccare con le dita del pensiero.
Amos Oz

giovedì 28 marzo 2013

The Truth About Geoengineering

Officials prepare to seed clouds near Bangkok, 2007. Royal Thai Air Force rainmakers hoped to coax rains to clear away thick smoke from forest fires and stubble burning. (Sukree Sukplang /Courtesy Reuters)
The failure to make much progress at the UN Climate Change Conference in Doha, Qatar this winter was yet another reminder that the world might soon face extreme climate shifts. In response, it is becoming increasingly likely that governments will adopt risky strategies, known as “geoengineering,” to rapidly cool the planet. Four years ago, in order to raise awareness about geoengineering, we published “The Geoengineering Option” in Foreign Affairs. Almost nobody thought that such tactics -- which included spraying particles into the upper atmosphere to make the earth more reflective, akin to how big volcanoes cool the planet -- were a particularly good option. The risks were simply too great and the unknowns too many. Still, if reliable data and specific models showed that climate change was about to get out of hand, we wrote, such drastic measures might start to look more appealing. The world could no longer ignore the geoengineering option, and we argued that a major science program should begin to explore it.
These days, barely a month goes by without new research that shows that the planet’s climate could be more sensitive to global warming than experts previously thought. For example, some ice sheets now appear a lot less stable than scientists had imagined. And new estimates of how much the sea will rise when ice sheets melt far surpass the best estimates of just a few years ago. It is clear that, unchecked, climate change won’t just menace natural ecosystems; it will also cause severe harm to humans and could even threaten national security. And, because governments have made barely any progress in controlling the emissions that cause global warming -- the 2000s saw the most rapid growth in emissions of carbon dioxide and other warming gases since the 1970s -- it’s not so crazy to imagine that some nation will launch an emergency geoengineering scheme, perhaps before its viability and consequences are understood...

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