People need to make sure that local governments are aware of the problems that can occur when too many houses are built. Wetlands must be protected by law. Everyone can help by not polluting and littering. Bullfrogs are important to have around, because they help farms, by keeping down the number of harmful insects. It's better to have bullfrogs eat the insects than to use chemicals for a few reasons.
Chemical treatment has to be done every year, and it is very expensive.
With bullfrogs, you only have to pay for them once, and the cost is low. Also, scientists don't always know if a chemical is dangerous until it hasbeen used for awhile. Bullfrogs have been able to survive the ice age which wiped out the dinosaurs.