The La Jolla Light presents this continuing series of online activities to undertake on your computer or tablet during your quarantine quandary. Lectures & learning • UC San Diego presents “A Deep Look Into Earth Day 2021: The Changing Climate of Our Natural World” at noon Thursday, April 22, online. UCSD researchers will offer a range of perspectives on how the climate, human activities and other forces interconnect with the natural world. Free. • Citizens’ Climate Lobby presents the “Wild & Scenic” film festival beginning at 7 p.m. Thursday, April 22, online. The event, which runs through April 27, features 20 award-winning films about nature, activism, conservation, climate change, wildlife, environmental justice and agriculture. $25 ($20 with discount code CCLSDN); $15 for students.