As a domain expert in the field of energy and environmental science, I am well-versed in the various sources and methods of producing hydrogen. Hydrogen is a versatile element that can be found in a variety of substances and can be produced through several processes. Let's delve into the specifics of whether hydrogen is in fossil fuels and how it can be produced from renewable sources.

Hydrogen itself is not a fossil fuel, but it can be derived from fossil fuels through processes such as steam methane reforming (SMR), where natural gas, which is primarily methane, reacts with steam to produce hydrogen and carbon dioxide. This method is the most common industrial method for producing hydrogen, but it is not the only way. The carbon dioxide produced in this process is a greenhouse gas, contributing to climate change when released into the atmosphere.

However, the statement you provided highlights an alternative and environmentally friendly approach to hydrogen production. Renewable energy sources such as photovoltaic (PV) solar panels, wind turbines, hydroelectric dams, geothermal plants, and biomass can generate electricity without emitting greenhouse gases. This clean electricity can then be utilized in a process known as electrolysis to split water (H2O) into its constituent elements, hydrogen (H2) and oxygen (O2). This method, often referred to as green or renewable hydrogen, is considered more sustainable and has the potential to significantly reduce our carbon footprint.

Electrolysis can be further categorized into different types, such as alkaline electrolysis, proton exchange membrane (PEM) electrolysis, and solid oxide electrolysis. Each has its own advantages and is suited to different applications. For instance, PEM electrolysis is known for its high purity hydrogen production and ability to respond quickly to changes in power input, making it suitable for integration with intermittent renewable energy sources.

The transition from fossil fuel-derived hydrogen to renewable hydrogen is part of a broader move towards a more sustainable energy system. It aligns with global efforts to combat climate change and reduce reliance on non-renewable resources. The use of renewable hydrogen can extend beyond just transportation and industrial processes to include residential heating, power generation, and even as a feedstock for the chemical industry.

In conclusion, while hydrogen can be produced from fossil fuels, there are cleaner and more sustainable methods available that utilize renewable energy sources. The shift towards these methods is crucial for our future energy security and environmental health.

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There is, however, another way to produce hydrogen without using fossil fuels in the process. Renewable sources of energy--PV, wind, hydro, geothermal and biomass--can be harnessed to produce electricity. The electricity, in turn, can be used, in a process called electrolysis, to split water into hydrogen and oxygen."Jan 5, 2009read more >>