The assertion that carbon dioxide (CO2) must be reduced is widely accepted globally. A set of empirical studies has confirmed that carbon dioxide is the main cause of the greenhouse gas (GHG) effect. GHGs are believed to be responsible for global climate change, resulting in massive floods, crop failures and melting polar ice caps, which threaten the future of humans and other living beings on the Earth.   
http://dlvr.it/S5NDH6