In the race to curb catastrophic climate change, prominent Australian businesses have been enthusiastic customers of carbon credits. They've been offsetting their emissions by buying credits from companies promising to stop exploitative timber harvesting, whilst lifting locals out of poverty.

But reporter Stephen Long has found that there is a vast chasm between what is marketed and what is really happening on the ground.

In a month-long trip, the team travelled to some of the most isolated villages in Papua New Guinea. They uncovered environmental devastation in the very areas one company claimed to be protecting and indigenous landowners angry at unfulfilled promises.

Long asks, who will really benefit from the carbon trade?

Monday's Four Corners report 'Fading Away' by Grace Tobin profiles the Australian mums fighting to keep their children alive.

For months reporter Grace Tobin and the team followed families as they struggled to get the right treatment for life-threatening eating disorders.

With more than one million Australians estimated to be living with an eating disorder at any time, they are also one of the deadliest of all mental illnesses.

The program explores the complexities of the illness and reveals a health system appallingly underprepared to deal with this crisis.

For 23-year-old Sara, who compares her eating disorder to a "monster", the solution is not as simple as just eating.

"It's so much more than just the actual food. For me, when I have food, there's so much guilt and shame and anxiety around it. That doesn't just go away if you eat the food," Sara says.

Her mother Jenny lives in fear, "I come home thinking, ‘Is she going to be collapsed on the floor or is she going to be okay?' ... She could die from it."

Another mother, Faye lost her daughter Caitlin after a 16-year battle with the disease. "She gave up on the system. The system is broken. It's so broken," she tells Four Corners.