Thank you for your courageous advocacy for divesting and keeping fossil fuels in the ground (16 March). I proudly signed the 350.org and Guardian petition asking the Gates Foundation and Welcome Trust to divest from fossil fuel companies and freeze new investments. Physics tells us that nothing happens unless energy is transferred from something to something else, but our use of fossil energy is rapidly disrupting the climate that sustains us. It is easy to envisage the necessary goal of a sustainable energy economy, but not how to reach it. The global energy system is huge, complex, resistant to change, and intimately woven into every aspect of our culture. Yet biofuels, solar, wind, and geothermal energy are available in superabundance, and the technologies for using them are waiting.

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