Marine life will proliferate in the absence of people. Modern cities will have vanished. They'll resemble this: This is how Times Square in New York City might look: The only evidence of human life on Earth will be the stone sculptures we have built, such as the Pyramids, the Great Wall of China, and Mt. Rushmore. All other living things will also have disappeared.
People have been asking themselves this question for thousands of years. Early writers such as Aristotle and Pliny the Elder discussed what life would be like if humans went extinct. In more recent times, scientists have tried to answer it too. In 1971, Edward O. Wilson wrote a book called On Human Nature that answered this question from an evolutionary perspective. He suggested that humanity has no special place in the universe and that our existence is likely just one of many possible paths that evolution could have taken.
Since then, researchers have continued to explore this idea by looking at what other animals do when faced with extinction. For example, some species appear to retreat into survival mode while others try to recover or adapt.
In addition to studying animal behavior, scientists have also looked at the history of life on Earth to get a sense of what might happen if humans went extinct. They have found that most large-scale biological events - such as the demise of the dinosaurs or the rise of modern birds - can be tied to specific causes.
There is no air conditioning, central heating, or electricity. Cities would darken and get frigid. Because there are no lights, candles or whale oil are utilized, which is beneficial to whales. People would have to walk or ride horses 15 miles to and from work, hence cities would shrink since getting to work would now take hours if you had to walk or ride a horse 15 miles.
The world we live in now depends entirely on energy. There is always some type of energy available, whether it's fossil fuels such as oil and natural gas or solar power. No single source of energy can meet all of our needs, so we need to use resources wisely. The problem is that some forms of energy are more polluting than others, especially fossil fuels which cause climate change. We need to find new ways to use energy without causing environmental damage.
In conclusion, energy is needed for many daily activities, such as keeping homes warm and cool, cooking food, powering vehicles, and making most products used in today's society. Without energy, life as we know it wouldn't be possible.
Every ecosystem on the planet requires biodiversity, and without it, the entire web of life, including people, will collapse. Species give essential resources for our survival. The ocean and biodiversity are interdependent. The ocean would be muddy and lifeless without biodiversity. Biodiversity is the source of many benefits for humans, including food, medicine, clean air, soil conservation, and aesthetic beauty. Humans depend on biodiversity for their survival.
In fact, without biodiversity, the world would be a very different place today. Many important innovations - such as the coconut, banana, and papaya - come from single species that evolved uniquely in one location or group of locations. Without these plants, humans would still be eating bananas whose seeds are covered in hard shells, or drinking milk from animals such as cows or goats. Evolutionary innovation depends on genetic diversity for each species to find new ways to adapt to changing conditions.
One example how biodiversity helps us survive is found in insects. Insects play an important role in cleaning out weeds and other plants matter that would otherwise choke other organisms. They also provide much needed nutrients for crops by feeding on their leaves. Without insects, we would need to use more harmful chemicals which could harm other organisms and reach into our own bloodstream when sprayed on crops.
Another example is provided by the oceans.
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