What a cop out. If we consider that time and space are a continuum, a limited temporal perspective also translates to a limited spatial perspective.
This might help to explain why the policies in place in many industrialized countries have such disastrous consequences for places like Africa and Latin America. A national perspective is externalizing all negative consequences, or at least as many as possible.
The problem being, eventually these consequences come back in one way or another, and you realize that externalizing them was just a form of mental trickery or self deception.
I agree with your statement that in the long run we are all dead. Life is short and we will die of course, no one is immortal. But the problem lies not death but on how we will die and what kind of life do we have today. As you have said consequence come back in one way or another, it just means that the development that we are longing at the price of the destruction of environmental balance will also affect us in our daily lives making our physical, mental, and spiritual health prone to illness not only by physical pollution and toxic but also by immorality.