One thing that is not in it is the poem by Emma Lazarus, which is on the Statue of Liberty. Nothing in the Law of the Land requires the U.S. to freely admit “the wretched refuse of your teeming shores”—or requires U.S. citizens to feed and provide housing and medical care for them. The load could crush our system, starting with the medical system.
I recently toured Portugal and Spain, where the clashes between civilizations and “little ice ages” were especially violent. The effects of climate change on the Iberian Peninsula over the centuries vividly demonstrate why we should not fear global warming: The effects of any plausible warming scenario for the coming decades will only be positive and contribute to human flourishing. They always do.