Here are some examples from different resources and different solutions (or yet to be identified solutions):

• Carbon Sciences May Save the World with Chalk (via EcoGeek)
  • Recover CO2, convert to $$$, prevent global warming, prevent further mining
• Canadian Chemical Companies Waste Enough Hydrogen To Power 200,000 Fuel Cell Cars (via Ecotality)
  • Recover hydrogen, convert to $$$, prevent global warming
• Overbuilt America (via Salon)
  • Utilize wasted resources (empty homes) and help a fella out (fight homelessness)

If we can tackle our problems systemically we can realize ever greater returns on resources used.