On life cycle basis they don't, except for second generation biogas digestors, hydropower stations and perhaps vertical axis wind turbines. But these cause other environmental harms.

Meaning that if you add up everything from the mining of raw materials till the end-of-life waste treatment, manufacturing solar panels and contemporary large-scale wind turbines consume more energy than they produce during their whole life cycle. In addition, that consumption is covered from fossil energy.

Renewable energy sources are derived from natural processes that are replenished continually, making them sustainable alternatives to fossil fuels. They play a crucial role in reducing greenhouse gas emissions by providing clean energy solutions. Here are some examples of renewable energy sources and how they contribute to reducing greenhouse gas emissions:

How Renewable Energy Sources Help Reduce Greenhouse Gas Emissions:

• Zero Emissions: Most renewable energy sources produce little to no greenhouse gas emissions during operation. This contrasts with fossil fuels, which emit CO2, methane, and other pollutants when burned for energy.
• Decarbonizing Electricity: By displacing fossil fuel-fired power plants, renewable energy sources reduce CO2 emissions from the electricity sector, which is a significant contributor to global emissions.
• Energy Efficiency: Renewable energy technologies often have higher energy efficiency and lower emissions per unit of energy produced compared to traditional fossil fuel technologies.
• Diversifying Energy Sources: Using a mix of renewable energy sources helps diversify energy supplies and reduce dependence on imported fossil fuels, enhancing energy security and resilience.
• Mitigating Climate Change: Transitioning to renewable energy plays a critical role in mitigating climate change by reducing overall greenhouse gas emissions, stabilizing global temperatures, and minimizing the environmental impacts associated with fossil fuel extraction and combustion.

In conclusion, renewable energy sources provide sustainable and environmentally friendly alternatives to fossil fuels. Their widespread adoption and integration into energy systems are essential for achieving global climate goals and reducing the harmful impacts of greenhouse gas emissions on the planet.