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.
How much is a Forever stamp worth I want to use them to mail a package? The value of the Forever Stamp is the domestic First-Class Mail  letter price in effect on the day of use.