Are planes really responsible for any part of global warming?

Many analyist, scientist and special reporters beg to differ that airplanes do not cause global warming and has a bad effect on the enviroment.
The Special Report 'Aviation and the Global Atmosphere', published by the Intergovernmental Panel on Climate Change (IPCC), is the first by the Panel on a specific industrial sector. It confirms that the world's 16,000 airliners are a major source of the gases that are causing global warming.

The IPCC Special Report Statistics Show that
- Planes are responsible for 3.5 per cent of man-made global warming today;
- They could account for up to 15 per cent of global warming by 2050

Simon McRae, Aviation Campaigner at Friends of the Earth said:
"This report proves aeroplanes are a significant threat to the world's climate. If current trends continue, greenhouse gas emissions from planes will rise, potentially undermining international treaties to protect the world's climate. Only a cut in the forecast use of planes will reduce overall aviation greenhouse gas emissions.”

What about improving airplanes?
It has been said that improving the airplanes would not even make the air cleaner.
Friends of the Earth's aviation campaigner, Richard Dyer, said:
"Cleaner aircraft are certainly needed, but they are not the solution to the rising impact of aviation emissions on our climate. Any benefits gained by building more fuel efficient aircraft will be swamped by the rapid growth in air travel. Government action is urgently required to curb the anticipated rise in flights. This must include ending the £9bn effective subsidy handed to the air industry by UK taxpayers every year, and the scrapping of ludicrous plans for a massive expansion of British airports."
The IPCC specia report says that: More efficient engines, better air traffic control and other operational improvements will not stop emissions rising, as the number of people flying grows. It suggests new taxes on flying and policies to substitute trains for short distance flights should be considered by Governments to cut aircraft emissions.