Because people don't want to die in the ensuing conflicts over limited resources that climate change is going to bring? Because shrugging one's shoulders at the thought of widespread environmental collapse, starving populations, and the breakdown of ten thousand years of civilization is a horrible thought? Because as the droughts and famines kick in, the people that suffer the most and the most immediately for the first dozen years will be the poor and those in underdeveloped countries, while Silicon Valley programmers sip their Soylent and write comments on Hacker News like this one?

Jesus, grow some empathy.

If the world's population continues to grow exponentially it's going to happen anyway with or without expensive carbon sequestration and silly offset schemes that never work.

Rather than store carbon in solid form, which in fact plants (rainforest and such) already do anyway without the unecessary expense, why not close coal fired power stations and build nuclear? They're safer and the waste is negligible compared to coal and can be further reduced (breeder reactors, thorium cycle etc.). Burning coal also throws heavy metals (Mercury and Arsenic to name a few) and SO2/SO3 into the air. Carbon dioxide is the least of coal's problems because it can be fixed by plants or turn into bricks with additional expense.