ABC Local: California’s ancient Redwoods have survived floods, fires and the logger’s axe, but the impact of global warming is still a big question mark. What will climate change mean for the sequoias of the Southern Sierra and the Coast redwoods up north? An unconventional experiment is taking place high above the ground in the branches of giant sequoias in the Whitaker Forest near Kings Canyon National Park. “Just spent the day crown mapping or branch mapping,” says researcher …