We all know that trees are good for us in a general sense: They take carbon dioxide from the air, helping to combat climate change. And while most of the oxygen we breathe comes from marine algae, trees still account for 28 percent of the oxygen in the atmosphere. Spending time around trees is also good for our health, with proven effects such as reduced stress levels and stronger immune systems. But during cold and flu season, the needles from many types of native conifers can be used to mak...
