There are no records of the Clinton campaign purchasing carbon offsets in their latest Federal Election Commission reports released earlier this month and, when asked, multiple campaign aides did not refute CNN’s reporting that offsets have yet to be purchased.

Clinton has made clean energy a key part of her 2016 campaign platform and a Clinton aide said in July that the campaign “will be carbon neutral.”

“We’ll be offsetting the carbon footprint of the campaign and that includes travel,” the aide said. Outlets, namely The Daily Mail, reported that Clinton flew private during the rollout of her clean energy plan.

On Monday, Josh Schwerin, a Clinton campaign spokesman, said that “offsetting our carbon footprint is still an important goal for this campaign.”