Another year research paper on nursing The report is filled with admissions of uncertainty, which are sometimes seized on as vulnerabilities. Uncertainty is, in fact, essential to the scientific enterprise, which is designed for self-correction. The evidence for human-caused climate disruption is increasingly clear. The magnitude of future disruption is a matter of scientific debate. But when the stakes are high, uncertainty is not a good justification for complacency. Which explains the existence of the insurance industry.