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1. "Carbon calculators" can help you to know how much CO2 is produced by you.
2. Almost one ton of CO2 per person may be produced during a flight across the Pacific Ocean.
3. That can be done by buying energy-efficient light bulbs, refrigerators, and other appliances. By installing solar panels, we can make homes and businesses greener.
4. It may be offsetted by walking, riding bicycles, and driving hybrid cars.
5. This article implies the need  of reducing CO2 levels in the atmosphere.
Because, otherwise it may lead to global warming.

My favourite sport is chess. Even though all my friends tell me that it's not a sport, I disagree. It requires as much hard work, as much training as all of the other sports. I loved chess since I was a kid. My grandfather is a chessmaster, and he introduced me to this wonderful game when I was 3 years old. He made me play with him, and even though I cried and didn't want to do it at first, I eventually warmed up to it. Sometimes he didn't feed me until I won at least one match against him, and, well, because I was 3 and not much of a chessplayer, I would go hungry for days. Then he was sent to jail, but I still keep his favourite chessboard. God, I love chess.