The Hill: Legendary House Speaker Sam Rayburn ushered in the 1933 Truth in Securities Act in the grim depths of the Great Depression. It was based on the principle that the purchase and sale of securities should be an honest bargain, and disclosure its cornerstone. But business trends change with the times, and today one that Sam Rayburn never heard of — climate change — presents a new major challenge to investors’ bottom lines. Investors representing over $1 trillion in assets filed a …