An excerpt by Hozan Alan Senauke in the book states, "The Bodhisattva precepts boil down to one essential principle: not to live at the expense of other beings. This is simple to say, and very difficult to do. Each of us must take complete responsibility for the world, as if the world’s fate depended on our words and actions. Whether we know it or not, it does."
However contentious the theory of global warming is, there are certain Buddhist tenets which must be observed.
1. Our actions have an effect.
2. Once we have become aware of these effects, future actions are volitional.
3. Our actions affect others, in this and in future lifetimes (such as those of our children).
So when you choose to purchase products that have an adverse effect on the environment, you should be aware of the karma you are creating. And this is not limited to the "global warming" issue. It has to do with the disposal of electronic products, the purchase of new or recycled paper, products containing BPA or PVC, whether you buy organic, if you buy seasonally or locally, etc. It all has an effect.
And the effect is not always obvious, or the solution black and white.
There was a time, not long ago, when the Hudson River was so polluted that it was only good for commerce and parlor jokes. The fishing industry was obsolete because the catch was too polluted to eat. For those of you who will respond "I don't eat fish, anyway," it's important to remember that birds and other fish don't have this choice and the health of a river has an enormous impact on the rest of the ecosystem. There are also many communities which depend on this river for their water source.
Today, I'm happy to say that the Hudson River, while not pristine, is back on track. You can swim and fish in it again, and the wildlife is making a comeback. This was accomplished through awareness, legislation, and a change in the attitudes of the people from acceptance to outrage. Numerous debates ensued about the need to dredge the river of PCB-contaminated soil and the result of stirring up the mess, or just letting it lie and allowing nature to cover it up with subsequent layers of silt (thus saving a very large blue-chip company millions). There were valid arguments for both sides, but the ultimate result was that people became involved with the well-being of the environment.
The Hudson is not the only US river affected by pollution. In June of 1969, the Cuyuhoga River in Ohio burst into flames for the fourth time. Again, this very polluted river is making a comeback, made possible mostly by awareness and outrage.
So, while the issue (and cause) of global warming is debatable, the effects of pollution in general are not. I think that creating awareness of the effects of our actions is beneficial, whatever you call the final result.
On the other hand, creating a non-existent crisis is also bad, because it ruins the credibility of the scientific community.
So one must go with the gut here, and perceive your own truth. For instance, I know that sitting in a garage with the car running and the door shut will kill me, but not because it got warmer in the garage.