A new study adds up the potential legal and financial risk countries could face from hundreds of agreements, like those under the Energy Charter Treaty.
The threat of a large lawsuit could be enough to discourage some countries from taking action on climate change.
The behaviour of TC Energy, the company formerly known as TransCanada, in Wet'suwet'en resulted in a nationwide crisis in Canada. It should not be repeated in Mexico.
Impact benefit agreements between energy companies and First Nations are typically confidential. But documents suggest First Nations may be trading away their Aboriginal rights.