Corporate environmental performance is of increasing importance to investors, public policy makers and the general public. Firms disclose environmental information (mostly) voluntarily in their annual reports and on their websites. These disclosures are important, because they provide environmental performance information and influence capital markets. We compare environmental disclosure in annual reports and on websites with a long-term (bad) and a short-term (crisis) environmental performance measure. We find evidence to support our hypotheses that different levels of environmental disclosure are made in annual reports and on websites under different conditions. More specifically, firms disclose more environmental information on their websites when faced with an environmental crisis and more in their annual reports when they have a bad environmental reputation.