Thursdays Best Bets on TV

“Planet in Peril: Battlelines” (9 p.m., CNN): CNN wants to save the planet. Correspondents Anderson Cooper, Sanjay Gupta and Lisa Ling travel the world to investigate where the battle lines over natural resources are being drawn — and what the outcome might be.

“CSI: Crime Scene Investigation” (9 p.m., CBS): A new era begins for “CSI: Crime Scene Investigation” as Laurence Fishburne debuts on the popular drama. Fishburne plays criminal pathologist Raymond Langston, the man who will eventually replace the outgoing Gil Grissom (William Petersen).