Final answer:
Fossil fuels pose significant 'input' problems such as habitat destruction during extraction, pollution and greenhouse gas emissions during transportation and processing, and contribute to climate change. The move towards renewable energy aims to mitigate these issues and promote a sustainable and secure energy future.
Step-by-step explanation:
The main current concerns associated with 'fossil fuels' as a problem of 'input' can be described in terms of environmental impacts and sustainability challenges. Extraction of fossil fuels often leads to habitat destruction due to invasive mining and drilling in sensitive ecological areas. Furthermore, the transportation of fossil fuels can lead to spills and leaks, harming aquatic ecosystems and posing risks to marine life.
Processing and combustion of fossil fuels result in significant air pollution, including the emission of greenhouse gases which contribute to climate change. This reliance on a non-renewable resource not only impacts global warming but also poses energy security issues, as the reserves are concentrated in certain geographical regions, leading to dependency and economic vulnerability.
The worldwide push towards renewable energy sources, driven by environmental concerns and the finite nature of fossil fuels, aims at reducing this dependency and mitigating the detrimental impacts mentioned. As we transition towards more sustainable energy sources, improvements in efficiency and reductions in costs are expected, potentially transforming the energy landscape in favor of environmentally friendly alternatives.