The change from natural grasslands to crops in the Canadian prairies (and probably northern U.S. states) has probably increased Summer thunderstorms, but decreased Spring and Fall storms.
(The change from natural grasslands to crops in the Canadian prairies (and probably northern U.S. states; has probably increased; Summer thunderstorms)
The change from natural grasslands to crops in the Canadian prairies (and probably northern U.S. states
has probably increased
Summer thunderstorms