Carbon cap or tax?

The article examines the best way to cut greenhouse gas emissions without harming the economy of the country. Stern Review report says that there is a need to invest about one percent of global gross domestic product (GDP) by 2050 in order to stabilize the levels of greenhouse gas at 500 to 550 parts per million. For example in Canada, a recent analysis by the National Round Table on Environment and the Economy (NRTEE) forecast that if carbon dioxide's price rose from $20 per tonnes by 2050, the emissions in Canada would possibly drop 60 percent below current levels.