How would you conclude this research paper written on alternative fuels?

gasfj questioned:

Need a close section. Here was my crappy intro:

With constantly rising gas prices and rising green household gasses polluting the ambiance; Here is more of a need than ever before for an alternate fuel. Lots of investigate has been done by car and gas companies to find a uncommon way to force our vehicles. Here are three main categories that they can be divided into: biofuels, gripping cars and hybrid cars.

Conclusios?