A serious warning about the threat to free speech by protracted lawfare even in the face of the First Amendment. Not to mention the situation in Canada.
Also the danger of allowing the validity scientific hypotheses to be litigated and decided by juries.
Also the vulnerability of scientists who are not on the verge of retirement.
A sideline on Earth Hour in Sweden, called off in a provincial town because there are so many newcomers that it is not safe to turn off the lights for an hour.