Based on the parliamentary records and social media posts found, I can verify this claim:

Verification of the claim:

• In a House of Commons debate from January 2026, Adam van Koeverden (Liberal MP and Parliamentary Secretary) stated that Conservatives "do not believe in climate change" and referred to "the Conservative caucus of climate change deniers"¹.
• He also accused Conservatives of wanting to "ignore climate change all together" in an Instagram post from February 2026².
• In another parliamentary speech, van Koeverden criticized Conservatives for "further misleading Canadians" about climate change measures and said "Conservatives do not care about facts" while being "more focused on supporting a nostalgic view and looking back into the rear-view mirror for inspiration"³.
• While van Koeverden has not used the exact phrase "pretending climate change doesn't exist," his statements that Conservatives "do not believe in climate change," are "climate change deniers," and want to "ignore climate change all together" are substantively equivalent to saying they pretend it doesn't exist²¹.

Overall validity: 95%

1. [PDF] Debates of the House of Commons - OurCommons.ca
2. Conservative math just isn't adding up these days. The PBO issued ...
3. Adam van Koeverden on Business of Supply | openparliament.ca