A hybrid is generally considered to be a good idea in the first place in terms of reducing emissions and fighting climate change. A plug in hybrid would be even better at that because it would be using electricity in the most efficient way and eliminating our reliance on fossil fuels and their emissions.
Hybrid cars use so much less gas and this will help to reduce emissions and combat global warming to a great extent. If we all drove hybrid cars and carpooled whenever possible this would cut emissions quite a bit and help fight global warming. This isn't possible at this time but may be in the future if the cars drop in price some.