It looks like you can blend something in the neighborhood of 10-15% hydrogen into the existing natural gas infrastructure without negative consequence. That's not game changing, but it's a significant environmental improvement if you're using renewables to produce it. It's a fine way to utilize daily or even seasonal renewables overproduction in a useful way without blowing up tons of existing infrastructure. Many diverse steps - some small, some large - are needed to get ourselves to a carbon negative lifestyle.