COVID-19 is a contagious disease caused by the coronavirus SARS-CoV-2. In January 2020, the disease spread worldwide, resulting in the COVID-19 pandemic. The symptoms of COVID‑19 can vary but often include fever,[7] fatigue, cough, breathing difficulties, loss of smell, and loss of taste.[8][9][10] Symptoms may begin one to fourteen days after exposure to the virus. At least a third of people who are infected do not develop noticeable symptoms.[11][12] Of those who develop symptoms noticeable enough to be classified as patients, most (81%) develop mild to moderate symptoms (up to mild pneumonia), while 14% develop severe symptoms (dyspnea, hypoxia, or more

Environmental issues have become one of the most discussed global challenges of the 21st century. Human activities have significantly changed natural landscapes, climate systems, and the balance of ecosystems. These disruptions threaten not only wildlife but also human health, food security, and the stability of economies worldwide. Understanding the causes and consequences of ecological problems is the first step toward finding effective solutions. Causes of Environmental Degradation Environmental problems are often the result of rapid industrialization, technological development, and unsustainable consumption. The main factors include: Industrial pollution – Factories release toxic chemicals and greenhouse gases into the air and water.