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We are the most fortunate generation that has ever lived. And we are the most fortunate generation that ever will. --George Monbiot What George Monbiot means by this is that our civilization has leveraged the awesome power of fossil energy to create a world that only a short time ago would have been nearly unimaginable. Our health, our wealth, our leisure, our freedom from tyranny and struggle, are all benefits bestowed upon us by harnessed energy of oil and coal. But the price of these gifts has been a growing environmental crisis. Our atmosphere is filling up with carbon dioxide, which is released by the burning of fossil fuels. Carbon dioxide traps the sun's heat, causing the temperature of our planet to rise. The reason why future generations are unlikely to be as fortunate as us is that fossil energy is just too good to be true. We cannot go on enjoying the benefits of this dirty energy. We must either address the problem, which will be a tough challenge involving many sacrifices, or ignore it, with unthinkable consequences. George Monbiot's Heat: How to Stop the Planet from Burning marks an important moment in our civilization's thinking about global warming. The question is no longer whether climate change is actually happening. The question is what to do about it. Monbiot offers an ambitious and far-reaching program to cut our carbon dioxide emissions to the point where the environmental scales start tipping away from catastrophe. (But not before he devotes a chapter tounmasking the vested interests that have spent fortunes funding the specious science of the climate change deniers.) He does not pretend it will be easy. The threshold for disaster, he argues, is a rise of two degrees centigrade above pre-industrial levels. Past two degrees, science tells us, the ability to control climate change passes out of our hands. At that point, the world's forests will fall into decline, changing cloud formation patterns and releasing the billions of tons of carbon the trees store. Past two degrees, the permafrost begins to thaw, releasing billions of tons of methane, a greenhouse gas far more destructive than CO2. At the same point, the polar ice begins to melt, affecting ocean currents and water levels. This is called a positive feedback loop, and it means that once we've passed two degrees, nothing can be done to stop it rising to three. And once we hit three, four will follow. Two degrees is also the point at which the globe slides towards increasing water scarcity and, eventually, food deficit. And the fact is, we're already seeing the consequences of climate change around the globe: collapsing ice shelves, the failure of the cyclical rains in Eastern Africa, drought in Australia, the spread of tropical diseases into new territory as temperatures rise, pollution of aquifers with salt water in Bangladesh. Global temperatures have already risen 0.6 of a degree, causing huge damage to the natural environment and inflicting suffering on vast numbers of people. The only way to avoid further devastation, and forestall the catastropheof positive feedback, Monbiot argues, is a 90% cut in CO2 emissions in the rich nations of the world by 2030. In other words, our response will have to be immediate, and it will have to be decisive. But where to start? Monbiot starts at home, where we have most control. Though he draws his examples from the UK, and commends Canadians for our superior building standards, he makes a damning case that the buildings we live and work in squander energy. Since our heat and electricity produce CO2, nearly every bit of heat and power we waste (like nearly every bit of heat and power we use) commits us to greenhouse gas emissions. Monbiot finds ways for us to build, and live, so much better that we can cut emissions at home by the required 90%. He then looks at the source of our electricity, and evaluates the arguments for both local micro-generation (for example, solar photovoltaic panels and