Firefighting efforts can help protect communities but can't tackle Canada's vast fire landscapeIt's another smoky summer in southern Ontario, and people breathing poor air in and around Toronto are once again asking what governments can do about wildfire smoke. Ontario Premier Doug Ford has defended the province's wildfire budget and has asked Ottawa for extra help. Some Republican lawmakers in the U.S. have also demanded Canada do more to stop smoke from drifting across the border. But experts say the politics can obscure a harder reality: fire is a natural part of Canada's forests, and a warming climate is making...