Green hydrogen from wind and solar electricity is necessary to decarbonize certain sectors of our economy that are inaccessible by renewable electricity, and it has the potential to reduce more than 30% of the global carbon emission. For low temperature membraned electrolyzers, polymer electrolytes play a critical role in controlling their cost, performance, and durability, and consequently their economic viability. In this presentation, I will focus on our work on anion exchange membrane electrolyzers. More specifically I will highlight the progress we have made in developing one of the most stable membranes and the corresponding electrolyzers. Current status and future challenges will be presented.