Mashable: Al Gore is hopeful.
In fact, the Nobel Laureate, who has spent years solemnly sounding the alarm on global warming, now sounds positively chipper.
In an interview with Mashable this week, he argued with the conviction of a barnstorming preacher that climate change has changed from a scientific issue to a grassroots social movement and expressed excitement that the cost of carbon-free energy sources are plunging to become competitive with fossil fuel prices.
This new, more ebullient Gore,...