The biggest problem with renewable power isn't the kinetic energy problem. The problem with solar and wind power is that they consume large amounts of rare earth metals. If the US were to convert to 10% solar or higher, it would lead to so much mining that the mining activity itself would be a greater threat to the environment than oil or coal. Additionally, solar batteries wear out in about 15 years and the constant dumping of old solar batteries would cause a huge problem with waste disposal. Wind, on the other hand, has problem with land use. If you want to have a significant amount of wind power you would consume all the farmland available. Wind also kills birds as well as can cause disruptions in weather patterns if deployed in large numbers. The best solutions are hydro and nuclear which are kindest to the environment.