The discrediting that is involved in undermining the validity or legitimacy of someone or something, often to weaken opposition or advance an agenda. It appears across politics, justice, economics, science, and culture. Conspiracy theories frequently use this tactic against scientists, especially in the context of climate change. Their methods include doubting the science, claiming evidence is uncertain or exaggerated; discrediting scientists by attacking their credibility or motives; promoting disinformation to confuse the public; and obstructing climate action by opposing policies aimed at reducing emissions. This strategy fosters mistrust and delays meaningful responses to climate challenges.