The green-energy landscape keeps changing:

Today there's a whole menu of options for going beyond the petroleum era, from biofuels and next-generation nuclear power to solar-powered syngas production. But which option will be the "magic bullet" for America's next energy era? Story continues:

Oceans in Peril:

"If current trends continue, the extinctions of the coming decades will be clearly visible to future geologists comparable in scale to the great extinction events in Earth's history," he wrote. "I think it will be an enigmatic extinction...Story continues: