This week's Question: A report released last week in London and addressed at the U.N. climate conference in South Africa said that reflecting a small amount of sunlight back into space before it strikes the Earth's surface would theoretically have an immediate effect on the planet's climate. This kind of geo-engineering and solar radiation management, some say, would be a more cost-effective and efficient way to combat global warming, and would be less disruptive of business activity. Geo-engineering the planet's climate, however, needs further research, and skeptics say that political concerns and unknown side effects, including changing weather patterns and rainfall, are too much of a risk. What do you think? Are geo-engineering efforts a promising way to address climate change?