Millions of people rely on real estate websites when they’re hoping to buy or rent a home. Major sites such as Zillow, Redfin, Trulia and Realtor.com feature kitchens, bathrooms, mortgage estimates and even school ratings. But those sites don’t show buyers whether the house is likely to flood while they’re living there. Now, Realtor.com has become the first site to disclose information about a home’s flood risk and how climate change could increase that risk in the coming decades, potentially signaling a major shift in consumers’ access to information about climate threats.