One example is planting a tree
Here are some others
-recycling
-helping our environment in many other ways
Was this a question about stewardship relating to biology or just stewardship in general?
The one with higher air pressure is Warm Air. The reason why is because when you boil water, the water always makes the lid rise. This is because Warm Air has more activity in its atoms and molecules, so it is moving around more, which in turn means that there is more pressure.
Hope I helped. :)
The ultimate source of energy is sunlight, and living things must break the sunlight down using their own methods to use it.