During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm repeatedly. Daily levels of CO2 can vary due to weather, and there are seasonal trends as well.
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The National Earth Science Teachers Association is a nonprofit 501 (c) (3) professional educational organization, founded in 1983, whose purpose is the advancement, stimulation, extension, improvement, and coordination of Earth Science education at all educational levels. We welcome new members, and offer numerous benefits to membership. We believe that the Earth Sciences are unique among the sciences, offering unparalleled opportunities for interdisciplinary learning and application in a field inherently relevant to learners of all ages. K-12 preparation in the Earth Sciences, prepares students to understand today's rapidly changing world. It offers experiences in a diverse range of scientific disciplines that have direct application to their lives.
Join NESTA today to support Earth and Space Science Education! NESTA is now offering discounted joint memberships with several Earth Science Teachers Associations. If you'd like to take advantage of this discount when you join or renew, be sure to chose the membership option of your choice with the Affiliate Earth Science Teachers Association in the registration process.

