One option is called carbon capture and sequestration, which involves capturing carbon dioxide from power plants before it is released into the atmosphere and storing it in underground caves. (treehugger.com)
One elephant population is known to continually visit underground caves where the animals dig up and eat salt - enriched rock. (scientificamerican.com)
Walking through massive underground caves for close to 70 minutes was incredible. (havebabywilltravel.com)