Our TV picks for Wednesday, April 24: Changing Planet, Married at First Sight, My 600-Lb. Life: Where Are They Now?

Changing Planet

KOPB 8 p.m.

In this season premiere, healthy coral reefs are vital to marine life. More than one million species depend on them, but climate change threatens these reefs. M. Sanjayan heads to the Maldives to see the efforts being taken to help their reefs survive.

Married at First Sight

LIFEP 8 p.m.

A successful marriage is half luck and half low expectations. But when people let science pick their partner, luck just might be on their side. This “where are they now” episode checks in on couples who are wafting between success and failure.

My 600-Lb. Life: Where Are They Now?

TLC 8 p.m.

Look back at patients from past episodes who struggled to live their lives as morbidly obese. With the help of Dr. Younan Nowzaradan, they got gastric bypass surgery, shed hundreds of pounds and are now trying to get healthier every day.