Places like Harrisburg are planting more trees to improve the urban canopy. But if roots of trees buckle a sidewalk, for example, a homeowner is on the hook — which leads some to resist.

The monitors are meant to track the amounts of pollutants like ozone, particulate matter, and carbon monoxide in the air. 

The agency isn’t certain where all the money will come from to pay for what it has planned. The effects of climate change have driven the price higher.

Researchers at the University of Pennsylvania say heavy industry could adopt strategies to cut emissions and capture carbon.

One tool meant to prevent the onset of wildfires in dying forests is a prescribed burn.

The increase in fee collections is largely due to recent increases in gas prices.