Climate Clock Initiative!

From this page:

The Climate Clock Global Initiative is seeking ideas from artist-led teams to create a major artwork entitled Climate Clock, which will measure changes in greenhouse gas levels and be the first in a series of global projects calling attention to climate change. Climate Clock will be an instrument of long-term measurement and will collect data for 100 years. The artwork will be located in downtown San José, California, Silicon Valley's city center, and will be a collaboration between an artist-led team composed of artists, international and Silicon Valley engineers and other creative professionals who are working with climate measurement and data visualization.
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It is anticipated that the budget for the construction of Climate Clock will be between $5 and $15 million, depending upon the scope of the final proposal. These funds are currently being raised, and will continue to be secured during the design phase of the project.