EF or ef may refer to:
The effects of global warming are the environmental and social changes caused (directly or indirectly) by human emissions of greenhouse gases.
The English Football League Championship (often referred to as the Championship for short or the Sky Bet Championship for sponsorship reasons) is the highest division of the English Football League and second-highest overall in the English football league system, after the Premier League.
The primary effects of cannabis are caused by the chemical compounds in the plant, including cannabinoids, such as tetrahydrocannabinol (THC), which is only one of more than 100 different cannabinoids present in the plant.
An effects unit or pedal is an electronic or digital device that alters how a musical instrument or other audio source sounds.
In statistics, an effect size is a quantitative measure of the strength of a phenomenon. Examples of effect sizes are the correlation between two variables, the regression coefficient in a regression, the mean difference, or even the risk with which something happens, such as how many people survive after a heart attack for every one person that does not survive.
Efficient energy use, sometimes simply called energy efficiency, is the goal to reduce the amount of energy required to provide products and services.
Beginning in the later half of 2008, a global-scale recession adversely affected the economy of the United States.
Effective altruism is a philosophy and social movement that applies evidence and reason to determine the most effective ways to benefit others.
As the center of Hurricane Katrina passed southeast of New Orleans on August 29, 2005, winds downtown were in the Category 1 range with frequent intense gusts and tidal surge.