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We develop a novel measure of climate policy uncertainty based on newspaper coverage. Our index spikes during key U.S. climate policy events—-including presidential announcements on international agreements, congressional debates, and regulatory disputes—-and shows a recent upward trend. Using an instrument for plausibly exogenous uncertainty increases, we find that higher climate policy uncertainty decreases output and emissions while raising commodity and consumer prices, acting as supply rather than demand shocks. Monetary policy counteracts these inflationary pressures, affecting the transmission of climate policy uncertainty. Firm-level analyses show stronger declines in investment and R&D when firms have higher climate change exposure.
