One more thing: even if we managed to do all this (which we obviously cannot), the impact on global temperatures would be hardly noticeable by 2050. According to the best-known climate-economic model, this vast undertaking would likely wind up reducing global temperatures by just one-tenth of one degree centigrade (one-fifth of one degree Fahrenheit), while holding back sea-level rises by only one centimeter (less than half an inch).
还有一点：即便我们拼死拼活把这些东西都建起来了（很显然，这是不可能的），但到了2050年时，这一切努力对全球气温的影响几乎微乎其微。照最著名的气候-经济模型推算，这场大规模建设最终将把全球气温降低0.1摄氏度（约为0.2华氏度），而海平面升高的幅度也只会减少1厘米（不到半英寸）。