The motion welcomed the Coalition's Green Deal, Green Investment Bank and ambitious carbon reduction targets.
It also called for improvements in energy efficiency and support for green infrastructure, transport and technologies.
Commenting, Liberal Democrat Secretary of State for Energy and Climate Change, Ed Davey said:
"The Liberal Democrats were campaigning for the environment long before it was fashionable.
"This is the greatest challenge of our age and the Liberal Democrats will not back down in the fight against climate change.
"Making this the greenest government ever won't be easy, but it is the right thing for Britain and the planet.
"We are building a new economy from the rubble of the old, an economy with green jobs and green technologies at its heart."