The major cause of carbon emissions is people. We exhale carbon dioxide. We also eat animals that in their life exhaled carbon dioxide. Since Shomer Shabbos people have lots of babies, we will sooner or later be seen as part of the problem. Remember that today’s “global warming alarmists” are the same people who screamed about “population bomb” in the 20th century (which in much of the world led to extreme anti-baby measures such as encouraging abortions, involuntary sterilization and “one child” policies).
As with most politically correct junk science (the “population bomb” of the late 20th century, the eugenic smovement of the early 20th century), there can be much to worry about, especially for Yidden.