Members of the House have voted to advance two energy bills, including one that puts timelines on environmental reviews on energy projects.
Gardner touted Colorado jobs and energy independence in an email.
Clinton said it would be inappropriate to comment on an issue under State Department review.
The Colorado Dem's bill would allow fast-tracking to WTO member countries.
The Senate hearing will dive into the recent increase in accidents of railcars carrying crude oil.
The package seeks to boost conservation at homes and federal agencies.
Whitehouse hopes the swing state will help make climate change a key issue in 2016.
House Speaker John Boehner (R-Ohio) on Wednesday called on the Obama administration to allow more exports of natural gas, which he said is a move that would help weaken the influence of Russia.
Chinese Premier Li Keqiang called pollution "nature's red-light warning."
Chipotle may stop serving guacamole if global warming continues to spike avocado prices.