I would love to have something in the fourth place here, but in terms of constant, clean, scalable energy, [solar] and wind and the other renewables aren't there yet because they're inconstant.
我在这里还会加入另一种方式： 一种持久的，清洁的 可持续发展的能源 太阳能，风能或其他可再生能源。 但现阶段这些可再生资源并不能提供持久的电力