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Several companies have faced criticism for their environmental practices over the years. Here are some sectors and notable companies that have been highlighted for their environmental impact or poor environmental practices:

1. Fossil Fuel Industry:

This sector is the most significant contributor to greenhouse gas emissions. Major companies in this sector have historically downplayed or denied their role in climate change.

ExxonMobil: Accused of knowing about climate change as early as the 1970s but funding climate change denial for years. Chevron, BP, Shell: All have faced criticism for their contributions to global CO2 emissions.

2. Mining:

Mining can lead to deforestation, habitat destruction, and water pollution.

Vale and BHP Billiton: Responsible for the Mariana dam disaster in Brazil in 2015. Glencore: Faced allegations of polluting rivers and not handling toxic waste appropriately.

3. Fashion:

The fashion industry, especially fast fashion, is a major polluter due to its high water usage, waste, and carbon emissions.

H&M, Zara, and Forever 21: All have been criticized for promoting fast fashion, leading to enormous waste and questionable labor practices.

4. Agriculture:

Large-scale farming, especially meat and dairy production, contributes to deforestation, water consumption, and methane emissions.

Tyson Foods, JBS, and Cargill: Significant contributors to global methane emissions due to their meat production.

5. Technology:

While tech companies often promote sustainability, some have been criticized for their environmental impact.

Apple: Previously criticized for not making products that are easily repairable or recyclable, though they've made significant strides in recent years. Amazon: Criticized for excessive packaging and its carbon footprint from deliveries, though it has also made pledges to become carbon neutral.

6. Automotive:

Many car companies have historically relied on fossil fuels, contributing to CO2 emissions.

Volkswagen: Caught in a major scandal for cheating emissions tests in 2015.

7. Palm Oil Producers:

Palm oil production has led to significant deforestation, especially in Indonesia and Malaysia.

Companies like Nestlé, Unilever, and Procter & Gamble have faced scrutiny for not ensuring their palm oil is sustainably sourced, though many have made commitments to improve.

8. Plastics and Packaging:

Companies that heavily rely on single-use plastics contribute to plastic pollution.

Coca-Cola, PepsiCo, and Nestlé: Have been named among the top plastic polluters several times in global audits.

It's worth noting that public scrutiny and pressure have led many of these companies to adopt more sustainable practices or set environmental goals in recent years. However, the efficacy and sincerity of these initiatives can vary, and ongoing vigilance and pressure are required to ensure these pledges lead to real change.