What was japans position in the kyoto protocal and how have they helped to improve climate change since then?

Im doing a dbate defending japns contribution and defending the need for improvment in climate change. All i know is that Japan was one of the countries to sign the protocol, but i dont know how they have helped the cause of climate change or what they were rerquired to do under the protocol, i onky found info on australia, the uk, germany, bangladesh and france