A small story, ultimately of no consequence, suggesting the "need" for a Nobel Prize for the Environment: LINK.
Funny as it may sound, I don't think it would be a very good idea to add such a prize. I would like to see more earth scientists honored for their contributions to understanding physics, chemistry, and dynamical system, but the Nobel prizes are so high profile, and climate change such a charged issue, I think such a prize would be politicized immediately. That would sully the award, because there would always be questions about why people get the prize. Not only that, but it would be difficult to separate scientific achievment in understanding the environment from conservation of the environment, which is more social science or economics or political or who knows what. If conservation groups tended to be awarded the prize, then earth scientists would be even less likely to be honored, since they wouldn't get the environment prize and they'd usually be excluded from the physics or chemistry prizes.
There is also the issue of the maturity of the fields of meteorology, oceanography, climate dynamics, environmental sciences, and such. While those of us in the field could come up with a list of deserving people, it would be difficult after a few years to say with confidence that a person(s) have made a lasting positive contribution. This comes up in the other science prizes when people complain that awardees get the award decades after the work, but the defense is that it takes that long to figure out what work needs to be honored. We don't really have very many decades of work to choose from (of course, excluding the early pioneers like Bjerknes, Charney, Richardson, Ekman, von Neuman, and many other dead folks).