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 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.
The energy released from a nuclear weapon detonated in the troposphere can be divided into four basic categories:
Beginning in the later half of 2008, a global-scale recession adversely affected the economy of the United States.
Efficient energy use, sometimes simply called energy efficiency, is the goal to reduce the amount of energy required to provide products and services.