Question

economic causes responsible for the decline of animal population

Answer 1

The answer to this question is really simple, its human greed in different ways. Like:
1. We kill them for our nourishment, i.e., hunting, poaching and killing or shooting of animals.
2. Also, they're being killed for medicinal purposes in some countries, this is also to save ourselves from diseases which threaten our lives.
3. We also kill them for trade or to sell their skin, tusks, horns, teeth, etc. illegally just for money.
     
   You see the interesting part is we humans are the cause of the decline of animals and then again we question again why there is a decline in them.

 Hope you understand the answer to your question.
Plese mark as Brainliest if it helps :):):)

Answer 2

Major Causes of Wildlife Loss

Humans use plants and animals for nearly every facet of daily life. Food, clothing, medicine, souvenirs, pets, and building supplies are just some of the uses that have led people to rely on wildlife. Humans fulfill these needs by overfishing rivers and oceans, poaching endangered animals, and overhunting important species. Wildlife exploitation is responsible for 37% of the loss in wildlife biodiversity. We are taking more than mother nature can provide.

Human Land Use Competing for Space with Wildlife

In addition, to keep up with unsustainable human population growth, more and more land is required. Cities are expanding at alarming rates and stretching beyond their original borders. Housing developments are infringing upon plant and animal homes by covering the earth with concrete, bulldozing hills to create flat lots of land, and damming rivers and streams to produce hydro-electricity. It’s no wonder that habitat degradation and change have resulted in a 31.4% loss of wildlife. Related to this is complete habitat loss, responsible for 13.4% of wildlife loss. Habitat loss is occurring in an effort to keep up with demands for agriculture which require huge tracts of land to produce feed. This feed is used for animals that are raised for meat on factory farms. To obtain these tracts of land, deforestation practices are utilized. Deforestation tears down trees and large plants, stripping animals of shelter and food.

Pollution

All of this human development produces pollution. Waterways are polluted with runoff from manufacturing facilities, factory farms, and the gas and oil that collects on roadways. Mining practices discard unusable heavy metals and minerals into groundwater sources. Air is polluted by the fumes from traffic and burning fossil fuels. Pesticides sprayed onto crops inadvertently kills other plant species. Garbage and littering fills the land with non-biodegradable plastics that can be consumed by animals both on land and in sea. All of these reasons and more explain why pollution is directly responsible for the loss of 4% of wildlife biodiversity. But, indirectly, it is responsible for more deaths because it causes global climate change. All of those greenhouse gases released into the air not only have a direct impact on the quality of air and water but they go on to trap solar radiation which leads to increased global temperatures, natural disasters, and glacial melting. Global climate change has exterminated 7.1% of all wildlife.

Disease

Finally, disease among plants and animals is responsible for a 2% loss in biodiversity. Disease is almost an aftermath of the aforementioned causes of wildlife loss because it occurs in unhealthy and unbalanced ecosystems. Although they are naturally occurring, an unhealthy ecosystem cannot fend for itself and fight off virus, fungus, and bacteria in the same way a healthy ecosystem can. Lower levels of biodiversity mean that the plant and animal community is less resilient to disease.

Exploitation 37%

2 Habitat Degradation/Change 31.4%

3 Habitat Loss 13.4%

4 Climate Change 7.1%

5 Invasive Species/Genes 5.1%

6 Pollution 4%

7 Disease 2%