Ideas Worth Spreading

TED Talks,in 18 min.max,are about ideas that
have the power to change attitudes, lives and ultimately, the world.
See this (1st of 3) riveting TED Talk & share responses with others:An Unusual Climate Change Idea.
Environmental scientist David Keith proposes a cheap, effective, shocking means to address climate change: What if we injected a huge cloud of ash into the atmosphere to deflect sunlight and heat?