Senator Mazie Hirono @maziehirono
Data from the Mauna Loa Observatory showed that carbon dioxide levels surpassed 415ppm on Friday for the first time in human history. We don't know a planet like this, but the generations after us will have to live with the consequences of our actions. We must act now. — PolitiTweet.org
Eric Holthaus @EricHolthaus
This is the first time in human history our planet's atmosphere has had more than 415ppm CO2. Not just in recorded… https://t.co/C2I6k2XFXz