13.2-How Do Our Activities Affect the Environment

13.2-How Do Our Activities Affect the Environment Important Formulae

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Human activities have a profound impact on the environment, often leading to significant changes in ecosystems and affecting the natural balance. Understanding these impacts is essential for promoting sustainable practices and protecting our planet.

1. Pollution

Pollution is one of the most significant consequences of human activities. It can take various forms:

  • Air Pollution: Emissions from vehicles, factories, and burning fossil fuels release pollutants such as carbon monoxide, sulfur dioxide, and particulate matter into the atmosphere, leading to health issues and climate change.
  • Water Pollution: Industrial discharge, agricultural runoff, and improper waste disposal contaminate water bodies, affecting aquatic life and making water unsafe for consumption.
  • Soil Pollution: The use of pesticides, herbicides, and fertilizers in agriculture can lead to soil contamination, affecting plant growth and entering the food chain.
2. Deforestation

Deforestation refers to the clearing of forests for agriculture, urban development, and logging. Its impacts include:

  • Loss of Biodiversity: Forests are home to a vast number of species. Deforestation disrupts habitats, leading to extinction and loss of biodiversity.
  • Climate Change: Trees absorb carbon dioxide, a greenhouse gas. Deforestation increases carbon emissions, contributing to global warming.
  • Soil Erosion: The removal of trees exposes soil, leading to erosion, reduced fertility, and increased sedimentation in rivers and streams.
3. Overexploitation of Resources

The excessive extraction of natural resources, such as water, minerals, and fossil fuels, leads to environmental degradation:

  • Depletion of Resources: Overfishing, mining, and water extraction can lead to the depletion of essential resources, affecting future generations.
  • Habitat Destruction: Resource extraction often involves destroying habitats, leading to loss of biodiversity and altering ecosystems.
  • Soil Degradation: Unsustainable agricultural practices can result in soil degradation, reducing land productivity and affecting food security.
4. Climate Change

Human activities, particularly the burning of fossil fuels and deforestation, contribute to climate change:

  • Greenhouse Gas Emissions: The release of carbon dioxide and methane from industrial processes, transportation, and agriculture enhances the greenhouse effect, leading to global warming.
  • Extreme Weather Events: Climate change results in increased frequency and intensity of natural disasters such as floods, droughts, and hurricanes, affecting ecosystems and human communities.
  • Rising Sea Levels: Melting polar ice and glaciers contribute to rising sea levels, threatening coastal habitats and human settlements.
5. Urbanization

The rapid growth of urban areas due to population influx leads to various environmental impacts:

  • Loss of Green Spaces: Urbanization often results in the conversion of forests and agricultural land into buildings, reducing green spaces essential for biodiversity.
  • Increased Waste Generation: Urban areas generate large amounts of waste, leading to pollution and challenges in waste management.
  • Heat Islands: Urbanization creates heat islands, where temperatures are significantly higher than in surrounding rural areas, affecting local climates.
6. Sustainable Practices

To mitigate the adverse effects of our activities on the environment, adopting sustainable practices is crucial:

  • Conservation: Protecting natural habitats and promoting biodiversity conservation helps maintain ecological balance.
  • Renewable Energy: Transitioning to renewable energy sources, such as solar and wind, reduces reliance on fossil fuels and decreases greenhouse gas emissions.
  • Waste Reduction: Implementing recycling and waste reduction strategies can minimize pollution and conserve resources.


How does phone production affect the environment?
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13.2-How Do Our Activities Affect the Environment

हमारे द्वारा किए गए कई कार्य पर्यावरण पर गहरा प्रभाव डालते हैं। हमारे दैनिक जीवन के विभिन्न पहलुओं में बदलाव लाने से पर्यावरण में परिवर्तन होता है। यह परिवर्तन सकारात्मक या नकारात्मक हो सकता है, परंतु अधिकतर मामलों में हमारे कार्य पर्यावरण के लिए हानिकारक होते हैं।

प्राकृतिक संसाधनों का अत्यधिक दोहन: मनुष्य ने अपनी बढ़ती हुई जनसंख्या और आवश्यकता के अनुसार प्राकृतिक संसाधनों का अत्यधिक दोहन किया है। जंगलों की अंधाधुंध कटाई, पानी की अधिक खपत, और खनिजों की खुदाई से पर्यावरण पर प्रतिकूल प्रभाव पड़ता है। उदाहरण के लिए, जब पेड़ काटे जाते हैं, तो प्रदूषण बढ़ता है और कार्बन डाइऑक्साइड के स्तर में वृद्धि होती है, जिससे ग्लोबल वार्मिंग होती है।

प्रदूषण: प्रदूषण विभिन्न प्रकार का होता है, जैसे वायु प्रदूषण, जल प्रदूषण, मृदा प्रदूषण, और ध्वनि प्रदूषण। उद्योगों, वाहनों और अन्य मानव गतिविधियों से निकलने वाले रासायनिक तत्व पर्यावरण को नुकसान पहुंचाते हैं। उदाहरण के लिए, जल में रासायनिक अपशिष्ट डालने से जल प्रदूषण होता है, जो जलीय जीवों के लिए हानिकारक होता है।

ग्लोबल वार्मिंग और जलवायु परिवर्तन: ग्लोबल वार्मिंग का कारण मुख्य रूप से ग्रीनहाउस गैसों का उत्सर्जन है, जैसे कि कार्बन डाइऑक्साइड (CO₂) और मीथेन (CH₄)। ये गैसें वायुमंडल में गर्मी को फंसा देती हैं, जिसके कारण पृथ्वी का तापमान बढ़ता है। इसके परिणामस्वरूप मौसम में असमानताएँ, अधिक बर्फबारी, सूखा, और अत्यधिक बारिश की घटनाएँ होती हैं।

प्राकृतिक आवासों की हानि: हमारे कार्यों से वनस्पति और पशु जीवन पर भी असर पड़ता है। जब हम जंगलों की अंधाधुंध कटाई करते हैं, तो इससे जानवरों के लिए आवास की कमी होती है। इसके कारण कई प्रजातियाँ संकट में पड़ जाती हैं और उनकी संख्या घटने लगती है। उदाहरण के लिए, जब वनों की कटाई होती है, तो इससे बाघ, हाथी और अन्य वन्य प्राणियों के आवास नष्ट हो जाते हैं।

कृषि और भूमि उपयोग: कृषि कार्यों के दौरान रासायनिक उर्वरकों और कीटनाशकों का उपयोग पर्यावरण को नुकसान पहुंचाता है। ये रसायन मिट्टी और जल स्रोतों को प्रदूषित करते हैं। साथ ही, भूमि की अति उपजाऊता को समाप्त कर देते हैं। उदाहरण के लिए, भूमि में अधिक रासायनिक पदार्थ डालने से मिट्टी की गुणवत्ता पर असर पड़ता है और यह अनुवांशिक परिवर्तनों को जन्म दे सकता है।

विकसित तकनीकें और उनका पर्यावरण पर प्रभाव: हालांकि तकनीक ने मनुष्य के जीवन को सरल बना दिया है, लेकिन इससे भी पर्यावरण पर नकारात्मक प्रभाव पड़ता है। जैसे, इलेक्ट्रॉनिक उपकरणों से निकलने वाले अपशिष्ट और कारखानों से उत्सर्जित गैसें पर्यावरण को प्रदूषित करती हैं।

विधि और गणना: पर्यावरणीय प्रभावों की गणना करने के लिए कई विधियाँ हैं। एक सामान्य रूप से उपयोग की जाने वाली विधि है, कार्बन फुटप्रिंट की गणना। इसका उपयोग यह निर्धारित करने के लिए किया जाता है कि किसी विशेष कार्य या उत्पाद से कितना कार्बन डाइऑक्साइड उत्सर्जित होता है।

गणना का एक उदाहरण:

मान लीजिए, अगर कोई कार एक किलोमीटर चलता है, और उसमें 0.2 किलो CO₂ उत्सर्जित होता है, तो 100 किलोमीटर चलने पर कुल उत्सर्जन होगा:

प्रति किलोमीटर CO₂ = 0.2 किलो

100 किलोमीटर में कुल CO₂ उत्सर्जन = $100 \times 0.2 = 20$ किलो CO₂

Why are some substances biodegradable and some non-biodegradable?

Solution:

Biodegradable and Non-biodegradable Substances

Biodegradable substances are organic materials that can be decomposed by microorganisms, such as bacteria and fungi, through natural processes. These substances, like food scraps and paper, contain carbon-based compounds that microorganisms can break down, returning nutrients to the ecosystem. Non-biodegradable substances, such as plastics and metals, are resistant to decomposition due to their synthetic or inorganic nature. Their molecular structure is complex, making it difficult for microorganisms to break them down. As a result, non-biodegradable substances persist in the environment, contributing to pollution and ecological harm.

Give any two ways in which biodegradable substances would affect the environment.

Solution:

Impact of Biodegradable Substances on the Environment

Biodegradable substances positively impact the environment by enriching soil fertility. As they decompose, they release essential nutrients, enhancing soil quality and promoting plant growth. Additionally, the decomposition process reduces landfill waste, minimizing the accumulation of non-degradable materials. This helps decrease pollution and mitigates the greenhouse effect, as fewer harmful gases are released during the breakdown of organic waste. Furthermore, biodegradable materials encourage sustainable waste management practices, supporting a circular economy by returning organic matter to the earth.

Give any two ways in which non-biodegradable substances would affect the environment.

Solution:

Effects of Non-Biodegradable Substances on the Environment

Non-biodegradable substances, such as plastics, can have severe impacts on the environment. Firstly, they contribute to soil pollution, as these materials can remain intact for hundreds of years, leaching harmful chemicals into the soil and affecting plant growth. Secondly, they pose a threat to wildlife; animals may ingest these substances, mistaking them for food, leading to injury or death. Additionally, non-biodegradable waste accumulates in landfills, taking up space and leading to potential groundwater contamination.

What is ozone and how does it affect any ecosystem?

Solution:

Ozone and Its Effects on Ecosystems

Ozone is a gas composed of three oxygen atoms (O3) and is primarily found in the Earth's stratosphere, forming the ozone layer. This layer plays a crucial role in protecting ecosystems by absorbing the majority of the sun's harmful ultraviolet (UV) radiation. Excessive UV radiation can damage plant life, reduce crop yields, and harm aquatic ecosystems. In aquatic environments, increased UV levels can disrupt the growth of phytoplankton, which are essential for the food chain. Thus, ozone is vital for maintaining biodiversity and the overall health of ecosystems.

How can you help in reducing the problem of waste disposal? Give any two methods.

Solution:

Methods to Reduce Waste Disposal Problems

One effective method to reduce waste disposal problems is practicing recycling. By sorting recyclable materials like paper, plastic, and glass, we can reduce the amount of waste sent to landfills and conserve natural resources. Another method is composting organic waste, such as food scraps and garden waste. Composting transforms biodegradable materials into nutrient-rich compost that can be used to enrich soil, reducing the volume of waste and enhancing soil health. Both methods contribute to sustainable waste management and minimize the environmental impact of waste disposal.