Humans have increased atmospheric CO 2 concentration by more than a third since the Industrial Revolution began. This is the most important long-lived forcing of climate change. Methane.
Buy Forever stamps online directly from USPS. The current Forever stamp value is 49-cents - the current First-Class Mail one-ounce rate.
The current price of a first class stamp is 49 cents. A domestic first class letter (1 oz.) is 49 cents.