DDT is already back in use in many places. In fact, it's been in use so much (mostly to protect crops) that there is significant DDT resistance in some parts of

DDT is already back in use in many places. In fact, it's been in use so much (mostly to protect crops) that there is significant DDT resistance in some parts of the world. Now, it's not as simple as DDT doesn't work anymore, but it's also definitely not the same as 'if we just used it, it would fix everything'. In fact, most 'bans' on DDT are actually primarily bans on agricultural use of DDT. Use of DDT as malaria vector control (for example in the United States) is allowed (as well as controlling other disease vectors). The problem is primarily the countries who haven't banned DDT for agricultural use, as it is that usage that has most greatly contributed to DDT resistance.