The health of family and friends may be the No. 1 priority for many people. For others, it may be the health of the planet. But at some point down the road, if not already, these paths will likely cross. Keeping the planet safer could mean extending the life expectancy of both.

Two companies working toward making sure health remains at an optimal level for people and the planet are UnitedHealth Group (NYSE: UNH), and Northland Power (OTC: NPIFF). But does that translate into a benefit for investors?

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Source Fool.com