Every one gives so much importance these days to water conservation - Remember Soil conservation is much more vital than water conservation. somehow we can produce water from sea water - but it may not be possible to produce soil - mainly top soil.
Stop cutting trees - more than trees stop destroying herbs - stop using herbicides
Stop removing not so harmful herbs in your farm land. definitely don't remove wild grass and herbs in not utilised LANDS/PUBLIC LANDS and in forests.
As much possible live simple, consume less, construct small, breath easy, lower your consumption/resource utilisations and live as an example for others to follow your foot steps.