Issues on Environment, Biodiversity & Climate Change (Part-I)

1. Over the past 50 years, humans have changed ecosystems more rapidly and extensively than in any comparable period of time in human history, largely to meet rapidly growing demands for food, fresh water, timber, fiber and fuel. This has resulted in a substantial and largely irreversible loss in the diversity of life on Earth.
2. The changes that have been made to ecosystems have contributed to substantial net gains in human well-being and economic development, but these gains have been achieved at growing costs in the form of the degradation of many ecosystem services, increased risks of nonlinear changes, and the exacerbation of poverty for some groups of people. These problems, unless addressed, will substantially diminish the benefits that future generations obtain from ecosystems.
3. The degradation of ecosystem services could grow significantly worse during the first half of this century and is a barrier to achieving the Millennium Development Goals.
4. The challenge of reversing the degradation of ecosystem while meeting increasing demands for services can be partially met under some scenarios considered by the MA, but will involve significant changes in policies, institutions and practices that are not currently under way. Many options exist to conserve or enhance specific ecosystem services in ways that reduce negative trade-offs or that provide positive synergies with other ecosystem services.

• Habitat loss and destruction/Fragmentation, usually as a direct result of human activity and population growth, is a major force in the loss of species, populations, and ecosystems. For ex. Tropical rain forests which once covered around 14% of land surface now only cover around 6% of land area
• Alterations in ecosystem composition/Co-extinction, such as the loss or decline of a species, can lead to a loss of biodiversity. For example, efforts to eliminate.coyotes in the canyons of southern California are linked to decreases in songbird populations in the area. As coyote populations were reduced, the populations of their prey, primarily raccoons, increased. Since raccoons eat bird eggs, fewer coyotes led to more raccoons eating more eggs, resulting in fewer songbirds.
• The introduction of exotic (non-native) species/Alien Species can disrupt entire ecosystems and impact populations of native plants or animals. These invaders can adversely affect native species by eating them, infecting them, competing with them, or mating with them. For ex. The Nile perch introduced into Lake Victoria in east Africa led eventually to the extinction of an ecologically unique assemblage of more than 200 species of cichlid fish in the lake.
• The over-exploitation (over-hunting, over-fishing, or over-collecting) of a species or population can lead to its demise.
• Human-generated pollution and contamination can affect all levels of biodiversity.
• Global climate change can alter environmental conditions. Species and populations may be lost if they are unable to adapt to new conditions or relocate

Disturbing soil by ploughing or tilling a field can cause the release of stored carbon dioxide back into the atmosphere. When farmers don't till their fields, carbon stays stored in the ground. This is an important way how agriculture can play a role in addressing climate change.

Carbon sequestration is the process of capturing and storing atmospheric carbon dioxide. It is one method of reducing the amount of carbon dioxide in the atmosphere with the goal of reducing global climate change.

If phytoplankton of an ocean is completely destroyed for some reason then.
(i) The ocean as a carbon sink would be adversely affected.
(ii) The food chains in the ocean would be adversely affected as the fishes live on them.
About Phytoplankton

• Phytoplanktons are microscopic plants, but they play a huge role in the marine food web.
• Phytoplankton, also known as microalgae, are similar to terrestrial plants in that they contain chlorophyll and require sunlight in order to live and grow.
• Most phytoplankton are buoyant and float in the upper part of the ocean, where sunlight penetrates the water.
• They require inorganic nutrients such as nitrates, phosphates, and sulfur which they convert into proteins, fats, and carbohydrates.
• The two main classes of phytoplankton are dinoflagellates and diatoms.
• Dinoflagellates use a whip-like tail, or flagella, to move through the water and their bodies are covered with complex shells.
• Diatoms also have shells, but they are made of a different substance and their structure is rigid and made of interlocking parts. Diatoms do not rely on flagella to move through the water and instead rely on ocean currents to travel through the water.

• Health Risks-E-waste contains toxic substances like lead, mercury, and cadmium. Improper handling leads to contamination of soil and water, causing neurological disorders, kidney failure, and long-term chronic diseases.
• Environmental Damage-Hazardous recycling practices pollute air, soil, and water. They also release greenhouse gases, worsening climate change and harming ecosystems.
• Economic Loss - Inefficient recycling causes wastage of valuable resources such as gold, silver, and copper, which could otherwise be recovered and reused in production.

A food chain is the transfer of energy and nutrients from one organism to another in the form of food. Producers form the base of the food chain, while apex predators occupy the top. Food chains illustrate feeding relationships and interactions among organisms, with each stage referred to as a trophic level. These levels begin with producers and progress through primary, secondary, and tertiary consumers.
A food chain represents the flow of energy from one organism to another, starting from producers and moving through different trophic levels. There are two main types: grazing food chains, where energy originates from photosynthesis and passes from plants to herbivores, and detritus food chains, which begin with the decomposition of dead organic matter, transferring energy through decomposers and predators. Both types are essential for energy transfer in ecosystems..

The Lion Tailed Macaque (Macaca silenus) is an old world monkey native to the western ghats of Southern India. Old World monkey is the common English name for a family of primates known taxonomically as the Cercopithecidae.

The ecological niche describes how an organism or population responds to the distribution of resources and competitors.

A niche is the sum of the habitat requirements that allow a species to persist and produce offspring.