What is the fine-grained topic of the following text: The hearing featured testimony from Mark Northam, executive director at the University of Wyoming’s School of Energy Resources; S. Julio Friedmann, CEO of Carbon Wrangler LLC; Noah Deich, executive director at the Center for Carbon Removal; and Feng Jiao, associate professor of chemical and biomolecular engineering and associate director for the Center for Catalytic Science and Technology at the University of Delaware. Only return the topic.
Testimony on Energy Resources and Carbon Removal