Does the natural decomposition of deciduous tree leaves form methane and contribute to global warming?

Oceanic methane deposits may have contributed to the Permian-Triassic extinction:
http://www.killerinourmidst.com/methane%...

The natural decomposition of deciduous tree leaves does form methane, but has no detectable influence on this planet%26#039;s temperature. By the way, if you didn%26#039;t know already global warming already ended a few years ago and we are in a global cooling, oh Al Gore didn%26#039;t tell you that did he! Oh another thing, when we were in times of global warming so were all the other planets in this solar system! If you haven%26#039;t figured this out already, the temperature of the planets in this solar system are directly proportional to their distance to our central star called the Sun. Oh, and one more thing, the temperatures of the planets in this solar system are directly effected by the temperature cycles of this solar system%26#039;s central star called the Sun! Don%26#039;t assume those of influence know what they are talking about and DO YOUR OWN RESEARCH! Besides the Global Warming scheme is too profitable to assume the politicians are telling the truth! Global Warming is just a huge scam! By the way, Polar Bears can swim over 100 miles you know! The ice sheets have grown 60% over normal growth this winter! Once again, DO...YOUR...OWN...RESEARCH! Thank you for reading!

No, because all of the carbon going into the atmosphere started there in the first place a year ago when the tree first grew those leaves.