the algae, like a plant, carries out photosynthesis and utilizes those nutrients. when the water gets too hot, the algae are producing so much oxygen because their rate of photosynthesis increases with temperature, that the oxygen they produce is sort of toxic, there's too much, so they become expelled. if the w water gets hotter still, the coral turns white. it's bleached, lost its algae, and the coral may die. so the plants see it as a place to live, and they just begin to grow there. if we don't have fish to eat them and to eat the algae, then it's like w weeds overgrowing your prize vegetables in your garden. in the last 25 years, we've seen a big shihift from what we ththk of as coral reeeefs to algal meadowows. narrator: since 1974, phil dustan has documented the demise of the once vibrant coral reefs along the florida keys and the cariribbean islands.s. dustan us photographphy, transect measurements, a species checklist, and continuous water temperature monitoring. on bali's menjangan reef, dustan worked with coral reef sentist carol milner. milner: the biod

brian: photosynthesis face of a cold-blooded killer linked to a islamic extremist behind the terror attacknow organized a sweeping review of all obama-era police reform agreements at the center of the high profile shooting. he advanced handing of authority back to local police chiefs. all right. now for something from another planet. ainsley: all right. thank you, brian. he was an atheist who sent out on a mission to destroy christianity and prove that jesus was not real. instead, he came away a believer. and now christian minister lee strobel best-selling book. he sold 7 million copies of this book. called the case for christ. you probably read it. it's hitting the big screen now on april 7th. >> i spent my entire career as a journalist uncovering the truth. until the day my wife presented me with the biggest story of my life. i'm not going to lose my wife and my kids to something i can't even reason with. >> what happened next changed me forever. steve: it did indeed. joining us right now is the author of the case for christ lee strobel. good morning to you, lee. >> good morning. good to