Unit 1: Developments in tradable permits carbon trading in the uk

The BBC reports that the tradable permits system is changing in the Uk

http://news.bbc.co.uk/1/hi/sci/tech/7736005.stm

a) Why are firms to be charged for 30% of the permits that they require?
b) To what extent do you believe this will reduce the market failure for 9i0 each firm and 9ii) the market as a whole