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Weather refers to atmospheric conditions that occur locally over short periods of time—from minutes to hours or days. Familiar examples include rain, snow, clouds, winds, floods, or thunderstorms.

Climate, on the other hand, refers to the long-term (usually at least 30 years) regional or even global average of temperature, humidity, and rainfall patterns over seasons, years, or decades.

Global warming is the long-term heating of Earth’s surface observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth’s atmosphere. This term is not interchangeable with the term "climate change."

Since the pre-industrial period, human activities are estimated to have increased Earth’s global average temperature by about 1 degree Celsius (1.8 degrees Fahrenheit), a number that is currently increasing by more than 0.2 degrees Celsius (0.36 degrees Fahrenheit) per decade. The current warming trend is unequivocally the result of human activity since the 1950s and is proceeding at an unprecedented rate over millennia.

Climate change is a long-term change in the average weather patterns that have come to define Earth’s local, regional and global climates. These changes have a broad range of observed effects that are synonymous with the term.

Changes observed in Earth’s climate since the mid-20th century are driven by human activities, particularly fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth’s atmosphere, raising Earth’s average surface temperature. Natural processes, which have been overwhelmed by human activities, can also contribute to climate change, including internal variability (e.g., cyclical ocean patterns like El Niño, La Niña and the Pacific Decadal Oscillation) and external forcings (e.g., volcanic activity, changes in the Sun’s energy output, variations in Earth’s orbit).

Scientists use observations from the ground, air, and space, along with computer models, to monitor and study past, present, and future climate change. Climate data records provide evidence of climate change key indicators, such as global land and ocean temperature increases; rising sea levels; ice loss at Earth’s poles and in mountain glaciers; frequency and severity changes in extreme weather such as hurricanes, heatwaves, wildfires, droughts, floods, and precipitation; and cloud and vegetation cover changes.

This website provides a high-level overview of some of the known causes, effects and indications of global climate change:

Evidence. Brief descriptions of some of the key scientific observations that our planet is undergoing abrupt climate change.

Causes. A concise discussion of the primary climate change causes on our planet.

Effects. A look at some of the likely future effects of climate change, including U.S. regional effects.

Vital Signs. Graphs and animated time series showing real-time climate change data, including atmospheric carbon dioxide, global temperature, sea ice extent, and ice sheet volume.

Earth Minute. This fun video series explains various Earth science topics, including some climate change topics.

Goddard Scientific Visualization Studio. An extensive collection of animated climate change and Earth science visualizations.

Sea Level Change Portal. NASA's portal for an in-depth look at the science behind sea level change.

NASA’s Earth Observatory. Satellite imagery, feature articles and scientific information about our home planet, with a focus on Earth’s climate and environmental change.

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Don’t chuck them out – the torches, which come with some (but not all) RATs, could lead you to an important scientific discovery. Or, at least, something fun to do for an hour while you’re in isolation. There are at least half a dozen things in your home that glow or change colour under UV light – some quite dramatically.

Ultraviolet light is exactly the same stuff as visible light – it’s just got slightly more energy. The photons in UV light are travelling at a slightly faster wavelength than those in violet light (hence the term ‘ultra-violet’).

When a photon hits a substance, it can be absorbed and then released again at a different (usually lower) level of energy.

What this means in practice is that light of one colour can be return as another colour. A substance, like the little lines of chemicals on your RAT, can absorb invisible UV light, and then shine out green or yellow light.

This is called photoluminescence.

Plenty of other stuff has photoluminescent chemicals in it. Here are a few things you might have in your house with that glow under UV:

During the initial lockdowns of 2020, some chemists even published an editorial in Matter on other objects in their kitchen they could get to glow.

But the list doesn’t stop there. Plenty of things have photoluminescent chemicals added to them deliberately during manufacture:

Even when they have easy access to a UV light, people don’t often check whether something glows under it.

It didn’t occur to any researchers to put a platypus under UV light until 2020, at which point they were amazed to discover it glowed green.

That discovery prompted the examination of several other marsupials, showing that wombats and some other Australian mammals glow as well.

Surprise fluorescence has popped up elsewhere, too – such as pink squirrels in the US.

Just last week, a paper in Communications Earth and Environment described a fascinating insight into ancient spiders, based on the researchers turning a UV light onto some fossils “more or less on a whim”.

So there’s plenty of stuff out there that glows under ultraviolet light. And there’s very likely some things we haven’t yet found!

If you discover something unusual glowing under UV light, Cosmos wants to hear about it. Send a picture of your UV-glowing thing to , and we’ll send a copy of The Best Australian Science Writing to the winning entry.

We know to avoid UV light from the sun, because of the risk of skin cancer. Commercial black lights and insect lights are designed to be too weak to cause a hazard, but the UV torches you get in RATs can be stronger.

Check the instructions in your test kit for specific directions – most will tell you to avoid shining the torch directly into your eyes, because there’s a risk the UV light can cause damage there, and some will be even stricter. And when in doubt, always avoid shining UV light on your skin.

Interested in having science explained? Listen to our new podcast.

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