While not a weapon for every climate issue, this does sound interesting in terms of how it can be utilized to address many issues. Supposedly there is more methane in the frozen ice of both hemisphere's than produced from fossil fuels. CRISPR's development is likely years away, but such scientific breakthroughs give hope for more breakthroughs.

It is not a magic bullet, but it will/could certainly help. But when you are dealing with problems like, and as big as, climate change, then you have to tackle them in many different ways, using all the methods you can find. Perhaps even "over engineering" the many solutions, it being better to do too much than too little.