Geo-engineering with Professor David Keith
Air Date: Mar 28, 2014 12:00 AM ET
Harvard scientist David Keith on why,despite the risks, we must investigate shooting particles of sulphate into the stratosphere, to combat climate change.
Top News Headlines
- 'Bigger than football': NFL, long a conservative league, dodged activism. Then came Trump
- Palestinian gunman kills 3 Israeli guards at West Bank settlement, Israeli police say
- Ontario's pot plan aims to protect us from ourselves: Neil Macdonald
- Ukraine peacekeeping pitch faces long road, even with Canada's backing