​Free CO2 savings for the summer: 1. Let your lawn grow out, a foot or more.  Notice the areas which grow faster due to variations in soil moisture, sunlight, etc.
2 For your first mowing, only mow the highest areas of your lawn. Leave any flowering vegetation, violets, chicory, etc. 
3. Repeat.          Green Science Corporation is a nonprofit group incorporated in Virginia and operating under 501(c)3 guidelines.   
FAQs for US Patent 7,789,048:
Is this a perpetual motion design?
No, the design is analogous to a refrigerator, where you are shifting a substance between phases. The heart of the converted engine is the recycling of the gases back into water, with no emissions. Energy inputs, similar to plugging in the refrigerator, are required. The beauty of the design is that energy inputs can be from sources with no operating cost, such as solar, or very low cost, such as biomass.
What can the converted engine produce?
Mechanical energy, to propel a vehicle for example, and/or electrical energy to power your home or recharge your alternate electrical vehicle.