As the Liberal Democrat delegates make their way home from their conference in Brighton today, many will be thinking about the next general election.

The Lib Dems have a tricky problem - they need to convince voters to vote for them and not the Conservatives, despite having been in a coalition government with them since 2010.

One area where there seems to be a clear difference between the two parties is the environment.

The climate secretary is a Lib Dem - Ed Davey. He told the Today programme: "There are some Conservative MPs who aren't signed up to the green agenda and who don't seem to see the huge opportunity there is to get our economy out of the mess it's in by investing in the green industries."

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