1. According to the Principle of Utility, conducting geo-engineering in order to counteract short-term effects of climate change can be viewed as the way of maximizing utility. Compared to the long-term negative side-effects which are considered as unknown, intentional manipulating can be regraded as a one hundred percent of making our environment better. It is an uncertainty if there will be negative side-effects and how much it will be. Therefore, conducting geo-engineering now is absolutely maximizing utility at present.
2. For the Formula of Humanity, it may undermine geo-engineering from the following aspect: the short-term positive effect is viewed as a means, and the negative long-term side-effects is as an end. Issues caused by geo-engineering will be discovered in the future, so if we only expect the short-term return instead of considering the side-effects, it is irresponsible for our future generation. According to Formula of Humanity, when treating humanity, we should never think others as a mean, but as an end.