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Pollution?

Chemicals we use every day on our crops or in our homes to kill unwanted pests and weeds can also harm or even kill other plant and animals species. Pesticides are often misused, used incorrectly, or used over too large an area. But even if used correctly, many cannot tell the difference between a pest and a friendly species. For example, some pesticides used on crops can harm the bees and other insects needed to pollinate these same crops. In addition, many chemicals have long lives and do not break down easily. They can "bioaccumulate" in food webs—as birds eat bugs, and larger animals eat birds, more and more harmful chemicals accumulate in the tissues of each animal in the food chain. Not only are species harmed themselves, but the foods they eat are also harmed.

Global Climate Change?

As humans burn more fossil fuels like oil and coal for energy, more carbon dioxide enters the atmosphere. Carbon dioxide acts like a greenhouse, letting sunlight and heat into the lower atmosphere, but not letting them back out. Other gases, including methane and nitrous oxide, released into the atmosphere due to human activities also contribute to global warming. As a result, average yearly temperatures on Earth have risen

Climate changes will alter the ecosystems in which many species—including humans—live. If a species requires a certain temperature or certain amount of water to live, it could face extinction if global climate change alters its environment. Other species—such as mosquitoes, certain diseases, and some pests—may flourish and expand their ranges.

Habitat Fragmentation and Degradation?

Some species require large areas of land or water in which to nest, forage, migrate, and mate. Human beings are encroaching on the habitats of many species. Land is constantly being converted from its natural state into farms, cattle grazing areas, mines, housing developments, golf courses, office buildings, shopping malls, and other urban and suburban areas.

What are the threats to biodiversity?

Many human activities, which stem from the population explosion of the past few decades and how we live, threaten biodiversity. There are 6 billion humans on Earth today, and that number may reach 9 to 12 billion in the next 50 to 100 years. In addition, humans are using proportionally more energy, land, water, and natural resources (such as trees, fossil fuels, minerals, plants, and animals) than ever before

Where is most of the biodiversity of the Earth located?

Even though they cover less than 10 percent of the planet's land surface, tropical rainforests contain more than half of all species. The rainforests of Central and South America, equatorial Africa and Southeast Asia are home to millions of species of plants and animals. Coral reefs, the "rainforests of the sea," are home to one-quarter of all marine life.
Deserts, prairies, wetlands, estuaries, ocean bottoms, mountain tops, temperate forests—even city parks, school yards, and backyards—are all home to diverse communities of plants and animals

Ecosystem Bodiversity?

Ecosystem diversity refers to the variety of habitats and climates on Earth. The interactions between these ecosystems and the species that live in them underpin all life on Earth. In fact, Earth's biodiversity helps keep our air and water clean, regulates our climate, and provides us (and other plants and animals) with food, shelter, clothing, medicine, and other useful products. What makes life on Earth so complex is this diversity and how it all interacts

Species Biodiversity?

Species diversity refers to the variety of different types of plants and animals, including bacteria, fungi, insects, mammals, plants, and everything in between. Differences occur within and between populations of species.

Genitic biodiversty?

Genetic diversity refers to the variety of genes within individual plants and animals and between different species. Think of the seedlings that grow from a packet of new seeds—or the variety of people within your own family. No two plants—and no two people—are exactly alike.

What is biodiversity?

Biodiversity, short for "biological diversity," refers to the variety of life on Earth. There are many levels of diversity—from DNA and genes to species, populations, ecosystems, and communities.