太阳能的价格将在未来30年内稳步下降 — — 大概每10年下降50 % — —而如果有足够大量的资金投入研究的话，我们可以进一步加快下降的速度。
The price of solar energy has been dropping steadily for 30 years – by about 50% every decade – and we could likely accelerate that decline further with sufficiently large investments in research and development.