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There's nothing fundamental about Ethanol that will require complete new engines, especially at 10%. It can be more corrosive, although fuel suppliers should add corrosion inhibitors to counter this. Worst case, it may require new fuel lines and maybe some other fuel system components. Not a complete engine. It has a higher RON so no need for fundamental engine changes to avoid detonation. While blended with petrol it is likely this will replace other RON boosters and overall RON will remain the same. The most likely problem is that it needs a slightly richer mixture. If the fuel system can't accommodate this automatically it may require some aftermarket changes, the simplest being an adjustable fuel pressure regulator to increase pressure slightly. On the other hand, Photosynthesis which is fundamental to all vegetation growing converts CO2 to Oxygen. Like most things in nature, there is an equilibrium with plants converting light, water and CO2 to Oxygen and food, then Animals consuming the food and oxygen and converting back to CO2. Reduction in vegitation is just as harmful as production of CO2. They should tax chainsaws as heavily as cars.