This week Swine flu and President Obama's first 100 days in office dominated the news:

• Grist covers the outbreak and its possible origins here.
• NRDC Senior Scientist Gina Solomon stresses the need for a strong public health system and offers tips on how to stay healthy.
• Joe Romm calls Obama the Green FDR and reviews his first 100 days.
• Grist reviews Obama's green achievements.
• Check out NRDC's interactive timeline of Obama's first 100 days and find out what Switchboard bloggers think about the President's progress on environmental issues so far.

In other news:

• Global warming could worsen Lyme disease by influencing the feeding patterns of deer ticks.
• Spain's AVE high-speed rail network is changing the nation fast. President Obama visits Spain to check it out.
• Report says that sixty percent of Americans live in areas with unhealthy air pollution levels.
• U.S. wind energy installs over 2,800 megawatts of new generating capacity in the first quarter of 2009.
• Steven Chu announces $193 million for renewable energy research.
• NRDC launched a new Renewable Energy for America feature that spotlights opportunities for farmers, agricultural communities and entrepreneurs to benefit by investing in renewable energy sources. NRDC's Nathanael Greene highlights the new mapping tool on his blog this week.
• The Obama administration overturns a Bush administration endangered species ruling that made it optional for federal agencies to consult government wildlife experts before taking actions that could harm threatened or endangered species.
• Senator Gillibrand unveils Safe Baby Products Act, a bill to get toxins out of baby bath products.
• The Obama administration considers asking 195 nations to enact mandatory greenhouse gas emissions cuts.
• A New York City-sized ice shelf breaks off of Antarctica.
• Alaska is fighting the recent listings of polar bears as threatened and Cook Inlet beluga whales as endangered.
• Bakersfield, CA, has the worst air pollution in the U.S.

Think I missed anything really great? Feel free to share it in the comments section. Want news updates every day? Check out my colleague Ben Jervey's blog on Greenlight.