Wildfire - controlled wildfires are actually beneficial to prevent the real bad ones and help refertilize. So they now let them burn down if possible and just control the edges where necessary.
Weed control - poisoned groundwater from herbicides/pesticides is a huge headache, so these are tightly regulated on substances and amounts.
Antibiotics - multiresistant bacteria have taken over since years. In turn, antibiotics are now prescribed more rarely and for longer periods (to make it resistant survivors less likely) and new antibiotics had to be developed.