Water in Bangladesh wells may be much less safe than previously thought, according to a new study of arsenic level testing kits.

When natural methods don't get the job done, many municipalities have to use reclaimed water to recharge aquifers.

Rice yields could decline about 40% by 2100, affecting about 2 billion people worldwide. What's more, the rice could contain twice as much toxic arsenic.

"...it just shows how much is still out there in the ocean that we don't know."