Environment Minister Dr. Harsh Vardhan said, global warming and climate change are adversely affecting the whole world and people should contribute to save the planet. Talking to All India Radio, the Minister said it is the duty of people to protect and preserve nature. <br/><br/>Calling environmental degradation a wake up call he asked people to adopt simple life style to avoid impeding dangers of degradation. He also asked people to use public transport and curb the use of air conditioners.