clean
Houseplants And Clean Air
Many of us like to have houseplants. They add a bit of nature to our homes and they look nice. It turns out that they have health advantages as well.
Energy Intensity
Every stage of civilization is characterized by its use of energy. From burning wood to steam engines to our electrified society, energy is behind everything we do. Over time, human society has become increasingly energy intensive. As our standards of living have improved and as we overcome the effects of weather – either cold or warm – it takes more and more energy to live the lives we lead.