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  • illustration of a landscaper in a crane, sawing a tree
    Too much carbon dioxide (CO2) in the atmosphere is mostly caused by two things: burning fossil fuels and the loss…
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    Balancing Act: Urban Trees and the Carbon Cycle

  • Balancing Act cover in Spanish
    Too much carbon dioxide (CO2) in the atmosphere is mostly caused by two things: burning fossil fuels and the loss…
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    Balancing Act: Urban Trees and the Carbon Cycle (Spanish)

  • A black and white illustration of a group of beetle larvae sleeping inside a tree trunk.
    Mountain pine beetles are important to the Western United States. They have a very special life cycle that includes staying…
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    Beetles Are Supercool! Understanding the Life Cycle of Mountain Pine Beetles

  • PDF preview of the Spanish version of "Beetles Are Supercool"
    Mountain pine beetles are important to the Western United States. They have a very special life cycle that includes staying…
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    Beetles Are Supercool! Understanding the Life Cycle of Mountain Pine Beetles (Spanish)

  • illustration of the back of a car on a street under a tree
    The scientists in this study wanted to know if cars parked in shady parking lots emit fewer gases than cars parked in…
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    Don’t Be So Fuel-ish! How Much Fuel Is Saved When Cars Are Parked in the Shade?

  • Don't Be So Fuelish cover in Spanish
    The scientists in this study wanted to know if cars parked in shady parking lots emit fewer gases than cars parked in…
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    Don’t Be So Fuel-ish! How Much Fuel Is Saved When Cars Are Parked in the Shade? (Spanish)

  • Cover for Don't Litter the Stream. It's a photo of a stream in a very green wooded area.
    From 1920 to 1950, a tree species called albizia (Falcataria moluccana) was brought to Hawai‘i from islands located north and…
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    Don’t Litter the Stream: An Invasive Tree Species and a Hawaiian Stream Food Web

  • Black and white illustration of three skiers in a snowy mountain. One skier stands up front holding a large thermometer while looking at their watch, while the other two skiers await anxiously behind.
    Slab avalanches are the most dangerous kind of avalanche. A slab is a layer of new snow sitting on top…
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    Excuse Me While I Flow My Snows: What Makes An Avalanche Happen?

  • Black and white illustration of three skiers in a snowy mountain. One skier stands up front holding a large thermometer while looking at their watch, while the other two skiers await anxiously behind.
    Slab avalanches are the most dangerous kind of avalanche. A slab is a layer of new snow sitting on top…
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    Excuse Me While I Flow My Snows: What Makes An Avalanche Happen? (Spanish)

  • The first page of the lesson plan titled "How much carbon is held by the world's forests?". The page has an illustration showing the process of carbon dioxide in the atmosphere.
    In recent years, the amount of carbon dioxide in the atmosphere has been rising. Scientists believe that higher levels of carbon…
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    Inquiry 3: How Much Carbon is Held by the World’s Forests?

  • PDF Preview of Inquiry 4 from World's Forests 2
    In recent years, the amount of carbon dioxide in the atmosphere has been rising. Scientists believe that higher levels of…
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    Inquiry 4: What Do the World’s Forests Have To Do With Climate Change?

  • The cover of "It's a Gas: The Exchange of Gases Between the Soil and the Atmosphere" featuring a black and white drawing of a person looking at a cow through a magnifying glass.
    Tropical forests are sometimes cut down so that humans can use the trees for wood and other products. Then, the cleared land is made into…
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    It’s a Gas! The Exchange of Gases Between the Soil and the Atmosphere