The Liberal Democrats have set out plans aimed at making Britain carbon neutral by 2050.
Included in the 10-point plan to be debated at next month's party conference are measures to improve the rail networks and increase lorry tolls on motorways.
Under the proposals, the UK would set a target of 30 per cent of electricity coming from non-nuclear, carbon-free sources by 2020, rising to 100 per cent by 2050.
The paper, published on Tuesday, noted that the government is aiming for an emissions cut of 60 per cent and the Conservatives of 80 per cent.
And under the measures, green taxes would be introduced to target the polluter, with any extra revenue used to reduce income tax.
There would be "green mortgages" to help people make their homes more energy efficient.
Other proposals, which the Lib Dems say would make Britain a world leader in tackling climate change, include "a leapfrog fund" to support clean energy in developing countries and improved flood defences to counter the increased threat from global warming.
Sir Menzies Campbell said on Tuesday that the Lib Dems "have become the first major British party to map out the route to a carbon neutral Britain".
"And the first to plan the way towards a cleaner global environment too," he said.
"Pollution doesn't respect national boundaries. Climate change is a global problem that requires an international solution.
"Britain should not be a bit player in finding that solution; we should be leading the pack.
"Under our proposals, the United Kingdom would set the green standard for others to reach."
Lib Dem environment spokesman Chris Huhne said the plans would put Britain in line with Sweden, Norway and New Zealand in tackling climate change
"Just as crucially, we have set out plans that are the first attempt of any British political party to tackle carbon emissions from every part of the economy: transport, energy, housing, offices and factories," he added.
"The time for talk has passed - we need action."
