There is no longer any credible scientific debate about the basic facts: our world continues to warm, with the last decade the hottest in modern records, and the deep ocean warming faster than the earth’s atmosphere. Sea level is rising. Arctic Sea ice is melting years faster than projected.
Heads of agencies are political appointees, with or without a little actual expertise in the subject matter. So, when a political hack claims that there is no longer any credible scientific debate, they are making a pretty strong assertion without an iota of supporting evidence.
The EPA has served its purpose and needs to be reduced in size by about 90%, with or without political hacks of either party in place.
There is climate change of course, but mankind has nothing to do with it. The Earth has been experiencing a cooling trend since 1998. The North Pole just experienced the coldest summer on record.
Warming about 0.1C per decade since that timeframe, see http://www.drroyspencer.com/latest-global-temperatures/ To start exactly at 1998 to derive a trend is pretty much the definition of cherry picking.