Sen. Elizabeth Warren (D-MA) is leading a group of Democratic lawmakers in pushing Texas officials for details regarding how cryptocurrency miners may be straining the state’s power grid, impacting climate change, and profiting from programs. In a letter, the group asked ERCOT, the Texas grid operator, for details on six years of miner electricity usage and carbon dioxide emissions. Other signatories to the letter are Sens. Sheldon Whitehouse and Ed Markey and Reps. Al Green, Katie Porter, and Jared Huffman.