In Washington, D.C., 24 people opposed to the gas-drilling technique known as fracking were arrested Monday after blockading the entrances to the Federal Energy Regulatory Commission. They were protesting what they call the agency’s rubber stamping of the industry’s push to export natural gas. They focused on Cove Point, a liquified natural gas export terminal proposed by Dominion Resources in Maryland, which the agency is due to issue a final decision on next month. On Sunday, more than 1,000 people joined a “people’s march” against Cove Point and the boom in fracking in the United States, which they say imperils health, safety and the climate.