Difference #1: Conservative environmentalism believes environmental protection is a good like any other, i.e. a thing that one rationally trades off against other goods to obtain.Difference #2: Conservative environmentalism genuinely believes in science; liberal environmentalism is quite happy to exploit mythology.
Difference #3: Conservative environmentalism is anthropocentric, not biocentric.
Difference #4: Conservative environmentalism insists on economic rationality.
Difference #5: Conservative environmentalism is respectful of property rights.
Difference #6: Conservative environmentalism believes environmentalism is not a religion.
Difference #7: Conservative environmentalism is respectful of national sovereignty.
Difference #8: Conservative environmentalism is honest about the number one threat to the American environment: immigration.
Difference #9: Conservative environmentalism is just as concerned with the human environment as with the natural environment.
Difference #10: Conservative environmentalism appreciates the way in which many environmentalist values, like the concept of stewardship, are really longstanding conservative values.
This is a key point. (not diminishing the others) Unchecked immigration, leading to overpopulation, will exacerbate the depletion of resources and corruption of the environment.