According to Associated Press reporter Sylvie Corbet, the U.S., Brazil, India and Russia have not yet joined the High Ambition Coalition for Nature and People. Let us hope that the Biden administration will bring the U.S. into this long-overdue international initiative, and encourage other countries to follow suit. DEAR DR. FOX: I love birds. DEAR DR. FOX: A friend has a son who is highly allergic to cats. Can cat dander remain in a home and cause problems many months later, or is the son being overly cautious?