"Scientific certainty" refers to a high level of confidence or proof that a scientific claim or finding is true based on evidence and rigorous scientific methods. Full definition
Waiting for an arbitrary standard of scientific certainty before changing any behavior is an option the world has, one option among many: the «continue as before» option. (science.slashdot.org)
They define «lack of full scientific certainty» and it becomes a conflict between genuine uncertainty and what is required to promote the political agenda. (drtimball.com)
Decision - makers should not wait for scientific certainty of harm before taking preventive action. (truth-out.org)