Great to hear from you again! Glad you are still alive. It is not illegal to claim asylum at a port of entry, provided you have made application at the first country you entered and have been denied. It is illegal to cross the border anyplace other than a port of entry. You may still claim asylum, but that does remove the crime of illegal entry. 90% of asylum claims are denied, so if the person is part of that 90%, then they are in the US illegally. At the moment many of those illegal entry claimants are being held in custody in detention centers. If the claimants do not wish to be held in detention centers they have the option of not crossing the border illegally. Since it is their choice to enter illegally, then the primary responsibility for the consequences are theirs. By your logic, since the US is currently one of the more impactful countries in the world, then all of the world's problems are the responsibility of the US. I reject that position. Please provide a link to back up your claim that the US and Canada lead the world in per capita pollution. My understanding is that China and India are, by far, the worst offenders. As for what the US is doing, please see https://www.epa.gov/clean-air-act-overview/progress-cleaning-air-and-improving-peoples-health.