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Coronavirus vaccine supply in the United States could be outstripped by demand. CNN's Nick Watt details why this may be a concern.

Walk-in COVID-19 shots will be available to anyone over 60 years of age at mass vaccination sites run by New York state starting Friday, Gov. Andrew Cuomo announced Wednesday. (April 21)

As his administration celebrates 200 million coronavirus shots in arms, President Joe Biden announced new employer tax credits and other steps to encourage people reluctant to be inoculated to get the COVID-19 vaccine. (April 21)

President Joe Biden is convening a climate summit with 40 world leaders confronted by Donald Trump's legacy of climate inaction. Responding to public sentiment, many U.S. states, cities and companies have taken action into their own hands. (April 21)

A man shot and killed a truck driver who was pumping gas at a convenience store Tuesday near Allentown, Pennsylvania. He also shot and wounded another man at the store. Authorities say the shooter fled on foot and then took his own life. (April 21)

President Joe Biden is "eager" to get a police reform bill on his desk, but White House press secretary Jen Psaki said what legislation is passed and when is the responsibility of Congress. (April 21)

“Secrets of the Whales” brings never-before seen footage of various whale species filmed across 24 global locations in a three-year span. The four-part Nat Geo docuseries narrated by Sigourney Weaver premieres Earth Day (April 22) on Disney+.

A longtime champion in the fight to legalize marijuana handed out joints in a New York City park Tuesday on what has become the unofficial holiday for cannabis. All you needed to do was show a COVID-19 vaccination card. (April 21)

This week the Biden administration is promoting a plan to boost electric bus production, proposing $45 billion spending to reduce American-made bus emissions to zero by 2030. White House correspondent Patsy Widakuswara has this report.