Cities across the United States are implementing varied strategies to address climate change, from innovative infrastructure projects to new funding mechanisms.

Denver is developing a plan to heat and cool buildings without fossil fuels, targeting the city's largest source of greenhouse gas emissions. The proposed solution involves using sewage as part of the heating and cooling system for large buildings including skyscrapers, though specific technical details of the implementation were not provided.

In Portland, Oregon, officials have successfully raised $1 billion through the Portland Clean Energy Fund, which generates revenue by imposing a retail tax on large corporations operating in the city. The fund is designed to support climate change action initiatives, and other cities are reportedly considering similar funding models.

Meanwhile, in the private sector, Boston Metal has secured $75 million in funding to expand its critical metals production capabilities. The startup, previously focused on cleaning up steel production processes, is shifting its emphasis with the new investment. Steel production currently accounts for approximately 8 percent of global greenhouse gas emissions.

These developments reflect a growing trend of municipalities and companies exploring alternative approaches to reduce carbon emissions and fund climate initiatives, ranging from infrastructure innovation to novel revenue generation methods.