CLARKSBURG, Calif. — On a sunny August morning in this agricultural town, before temperatures soared to 103 degrees, U.S. Health and Human Services Secretary Xavier Becerra stood outside the small public library. He came to talk about the Biden administration’s efforts to protect farmworkers from extreme heat and wildfire smoke, two emerging public health issues at the forefront of the climate crisis. “There are still not enough protections for workers that are picking the food that we eat,” Becerra told a group of local reporters and government officials, who outnumbered the farmworkers in th…