United Nations Secretary-General António Guterres called out the world’s largest emitters to do their part to reduce carbon emissions in kicking off the 77th session of the U.N. General Assembly in New York City.

Startups and more established suppliers of products that reduce the carbon footprint of concrete are developing systems to make the product more sustainable. Some are even seeking ways to produce the material and its ingredient, Portland cement, without the carbon-intensive process that's been required since it was first used.

The CHIPS and Science Act aims to bolster U.S. leadership in innovation and technology. For some Top 100 sustainable design firms like Flad Architects, it’s an opportunity to expand into science and technology markets.

Wildlife crossings over major highways are growing in popularity as increasing evidence shows they are a cost-effective method to improve safety.