Emergency pumping to ease Everglades flooding could end up worsening pollution in Lake Okeechobee. At the start of the summer rainy season, western Broward and Miami-Dade counties are already filling up with too much water too fast. That has triggered extra pumping to save swamped wildlife and to also head off future risks for western communities. The emergency pumping is moving water north through Palm Beach County and into Lake Okeechobee —…