Larger ecosystem may be prone to sudden collapses once they have been pushed past a tipping point.
Elephants have long been known to linger at the carcasses of dead mates.
Tropical forests are losing their ability to absorb CO2 from manmade greenhouse gas emissions faster than expected.
The unique creatures may go the way of the dodo unless conservation efforts are stepped up.
Should you go to a store in person or should you shop online to reduce your carbon footprint?
In just a few months some 5.8 million hectares of broadleaf forest burned down in New South Wales and Victoria.