Trees are essential to our survival—from making oxygen so we can breathe, to cooling urban environments, to literally holding the ground together to prevent erosion, trees do so much for us!

Yvonne Aki-Sawyerr, mayor of Freetown, Sierra Leone, is on a mission to plant a million trees over the next two years, increasing vegetation in her city by fifty percent while shoring up eroding riverbanks and increasing biodiversity....

Reaching heights of over 100 meters, Californian sequoias tower over Earth's other 60,000 tree species. But even these behemoths seem to have their limits: no sequoia on record has been able to grow taller than 130 meters. So what...

Today we're talking about the weirdest trees in the world, from the psychedelic rainbow eucalyptus, to the dragon's blood tree, to the jabuticaba that grows delicious fruits on its trunk.<b<br/>r/>

Hosted by: Hank Green (he/him)

There's a tree species that used to be all over the world. And now, they can only be found in a secret valley in the mountains in Australia. This is the story of the rise and fall of the Wollemi Pine, including how some new tech might...

Did you know you can read the story of a tree's life? By looking at a tree's rings, you can figure out way more than just how old it is! Jessi and Squeaks are here to show you what to look for next time you're on a hike and find a tree...

Learn how trees are able to communicate with each other through a vast root system and symbiotic fungi, called mycorrhizae. -- Most of the forest lives in the shadow of the giants that make up the highest canopy. These are the oldest...

From the Avocado to Pando, we love trees! They do so much for us, from making oxygen so we can breathe, to cooling urban environments, to literally holding the ground together to prevent erosion! The SciShow team is joining

This week on CC Myth, Mike Rugnetta is teaching you about mythical trees. There are lots of trees in myth, and we've touched on some of them before, but today we're going to focus on three trees from three different traditions. We'll...

Jessi and Squeaks just spent the day hiking and sketching evergreen trees in their field journals! A lot of evergreen trees look pretty similar, but Jessi knows some fun ways to tell them apart. Join us to find out how!

Trees are a super-efficient way to sequester carbon, but since planting the wrong trees in the wrong place can do more harm than good, we need to go about tree planting more carefully.

A forest is much more than what you see, says ecologist Suzanne Simard. Her 30 years of research in Canadian forests have led to an astounding discovery -- trees talk, often and over vast distances. Learn more about the harmonious yet...

American chestnut trees were all over the US at the end of the 19th century until the fungus wiped most of them out. Scientists have been trying to figure out ways to bring those endangered American chestnuts back to their former glory.

True Pines (conifer trees in the genus Pinus) are often confused with other members of the Pinaceae family like Picea (Spruces), Abies (Firs), Pseudotsuga (Douglas-firs) or Larix (Larches). So is very likely that your Christmas tree is...

By 2050, it's estimated that over 65% of the world will be living in cities. We may think of nature as being unconnected to our urban spaces, but trees have always been an essential part of successful cities. Humanity has been uncovering...

Can you guess how tall the tallest tree is? Neither could we! Tag along with Jessi and Squeaks to learn all about the world’s tallest tree!

Today humanity produces more than 1,400 tons of carbon every minute. To combat climate change, we need to reduce fossil fuel emissions, and draw down excess CO2 to restore the balance of greenhouse gases. Like all plants, trees consume...

Jessi and Squeaks are thinking of visiting the redwoods, the tallest trees in the world, but there's lots for them to learn before they make their trip! First Grade Next Generation Science Standards Disciplinary Core Idea: LS1.A:...

They don’t call water the building block of life for nothing, most living things need it. The palo verde tree, however, has managed to skate by needing it a lot less than the rest of us.

Science writer Richard Preston talks about some of the most enormous living beings on the planet, the giant trees of the US Pacific Northwest. Growing from a tiny seed, they support vast ecosystems -- and are still, largely, a mystery.

Ancient trees are fascinating, but the answer to the question in the title isn't as cut and dried as it might first seem. There are two major contenders for the superlative, and Hank has all the important information on both of them in...

Bears are known for scratching their backs on trees, but it turns out that they might be using trees as a dating app.

It turns out that defining what is and isn't a “tree” is way harder than it seems.

We love trees, but the main problem is that they aren't exactly travel-sized. However, new technology wants to bring the fresh-air benefits of trees to places that the real deal just can't thrive, like dense urban areas!