Eight industrialized nations concluded their summit Friday after reaching an agreement on aid to Africa, but failing to reach consensus on climate change or missile defense. Two experts detail the conference results.

Members of the Group of Eight industrialized nations met in Germany Wednesday for the start of a three-day summit at which a main topic will be climate change. A German journalist and American international policy advocate discuss the conference.

Danish author and statistician Bjorn Lomborg discusses his proposal to redirect resources from a general fight against carbon emissions to specific efforts to mitigate the effects of climate change in vulnerable areas.

Among businesses addressing the global warming issue, the Chicago Climate Exchange is creating a trading market with financial incentives to reduce emissions of carbon dioxide, methane, and other greenhouse gases.