It’s fun to ponder the relative importance of “nature versus nurture” in determining the origin of people’s personalities and characteristics. Twins, for example, make great case studies. Well, the same is true for planets, and one of the best examples to consider is Venus, a near-twin of Earth in some ways but profoundly different in others.

Venus is only about 5 percent smaller than Earth and has about the same density-meaning that it is essentially a rocky, terrestrial planet very much like our own. Both planets have atmospheres, and Venus even orbits in the same general neighborhood of the inner solar system as we do, at an average distance of 0.72 astronomical units compared to Earth’s 1.0. But that’s where the similarities end. Venus is barely spinning, taking about 243 Earth days to spin once on its axis-backward! The Venusian atmosphere is much thicker than ours, with 90 times the pressure at its surface. That thick atmosphere sports violent upper-level wind speeds of more than 218 miles (350 kilometers) per hour and is almost entirely carbon dioxide, with only scant traces of the nitrogen dioxide, oxygen, and water found in Earth’s atmosphere.

The carbon dioxide molecule is transparent to visible light but is exceedingly good at trapping heat radiation (like a greenhouse), causing the surface of Venus to be very hot more than 750 kelvins, or about 300 degrees hotter than an oven!

Astronomers are trying to understand how Earth and Venus ended up with such radically different surface conditions. Understanding carbon dioxide may be the key.

Earth has as much carbon dioxide as Venus, but it dissolves in our oceans and is trapped in rocky carbonate minerals.
Any ocean on early Venus, slightly closer to the Sun, would have since evaporated away, however, leaving no way to remove the carbon dioxide.

Venus is a case study of carbon dioxide gone wild and is a prime example of how studying other planets can help us understand what may be in store for our own world.

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Earth’s resources
All the materials we have a tendency to use, and therefore the things we have a tendency to build from them, return from the planet. Some are natural and are utilized in their raw type, like wood, stone, and ceramics. Others, like artificial fibers and human-made plastics, ar created by process natural resources like oil and minerals. The energy to create of these merchandise conjointly chiefly comes from the planet, as fossil fuels. These resources cannot last forever and that we cannot place most of them back.

As the most easily-reached sources of coal, gas, and oil are being employed up, miners and drill rigs should attend remote mountains, deep oceans, and frozen seas in search of a lot of. At today’s rate of use, celebrated coal reserves could run out at intervals a hundred and twenty years, whereas oil and gas reserves can last but eighty years.

About half all forests ar adult and harvested in a very property approach for paper, timber, and fuel. However quite half Earth’s tropical rain forests are slow down within the past a hundred years, for rare timber and farmland. nearly none of those tropical forests are replanted.

As Earth’s population rises, humans want a lot of clean water for drinking, cooking, and laundry. We have a tendency to conjointly use water for growing crops and raising livestock. Water has got to be clean and refined before we will use it, which needs energy and resources.

Farmers want fertile soil to grow crops. Pollution or over farming (growing an excessive amount of of a similar crop within the same place) will injury the soil, creating fertile land a resource that must be protected.

Humans round the world want energy to power cities, vehicles, homes, and factories. Energy is another quite resource. Today, most of it comes from burning fossil fuels, however within the future we’ll have to be compelled to notice cheaper, less polluting energy sources.