Bill McKibben explains the degree of the threat of fossil fuel in the April 25, 2013 issue of Rolling Stone.  Here’s the opening paragraph:

It got so hot in Australia in January that the weather service had to add two new colors to its charts. A few weeks later, at the other end of the planet, new data from the CryoSat-2 satellite showed 80 percent of Arctic sea ice has disappeared. We’re not breaking records anymore; we’re breaking the planet. In 50 years, no one will care about the fiscal cliff or the Euro crisis. They’ll just ask, “So the Arctic melted, and then what did you do?”

And consider the opportunities being lost to a continued dependence on fossil fuels:

It’s an economic resistance movement, too, one that’s well aware renewable energy creates three times as many jobs as coal and gas and oil. Good jobs that can’t be outsourced because the sun and the wind are close to home. It creates a future, in other words.