Climate

Satellite gravity and altimetry measurements show Antarctica has been losing land ice mass overall since the early 2000s, with West Antarctica and the Antarctic Peninsula losing ice rapidly even though East Antarctica's interior has shown modest and regionally variable gains that do not offset the continent-wide net loss.

Trump has claimed that China created the concept of global warming to hurt US industry. This is false. Human-caused climate change is established by more than a century of independent international science.

Past climate variability is well-documented and driven by orbital cycles, volcanic activity, and solar output. None of these natural drivers can explain the rapid warming observed since 1950; human CO2 emissions are the primary identified cause.

CO2's properties as a greenhouse gas, absorbing and re-emitting infrared radiation, were established experimentally by physicist John Tyndall in 1859 and have been confirmed by countless laboratory measurements and satellite observations since. This is foundational physics with no credible scientific dispute.

The so-called global warming hiatus of the early 2000s to mid-2010s reflected a temporary slowdown in the rate of surface air temperature increase, driven largely by heat uptake in the deep ocean and natural variability, not a stop in warming, and updated temperature records show the slowdown was smaller than initially estimated.

The IPCC Sixth Assessment Report (2021-2023) concludes it is unequivocal that human influence has warmed the atmosphere, ocean, and land. More than 97% of actively publishing climate scientists and over 99% of peer-reviewed climate papers endorse anthropogenic climate change.

Rising carbon dioxide levels can modestly enhance the growth of some plants in isolation under controlled conditions, but the IPCC's Sixth Assessment Report confirms that human-caused warming has already reduced global agricultural productivity growth overall. The net effect of rising CO2, once its accompanying climate impacts such as heat stress, drought, and extreme weather are included, is harmful to global food security rather than beneficial.

Only a small fraction of plastic types, primarily PET and HDPE, are commonly and effectively recycled in practice, while the majority of plastic produced globally is landfilled, incinerated, or leaked into the environment because most plastics cannot be economically or technically recycled at scale.

Global emissions are driven far more by per capita consumption differences between rich and poor countries than by population size alone, with the wealthiest 10 percent of the global population responsible for roughly half of consumption-based emissions while population growth is concentrated in low-emitting regions.

Life cycle assessments generally find that paper bags require more energy and water to produce than plastic bags and must be reused fewer times to break even, while both are outperformed environmentally by reusable bags made of durable material used many times.

Large-scale tree planting can meaningfully help absorb carbon dioxide over decades but cannot by itself offset current emission rates, and studies show forests take years to mature into effective carbon sinks while some proposed planting schemes have overstated realistic carbon capture potential.

Recycling rates and environmental benefits vary widely by material, with aluminum and paper recycling delivering substantial energy savings and emissions reductions, while contamination, weak markets for mixed plastics, and inconsistent municipal systems limit the effectiveness of some recycling streams.

A small number of media articles in the 1970s speculated about global cooling, but the scientific literature of that decade already showed more studies projecting warming from rising CO2 than cooling, and instrumental records confirm warming resumed and accelerated after the mid-1970s.

The ozone hole is caused by chlorofluorocarbons and related chemicals breaking down stratospheric ozone concentrated over Antarctica, a distinct and separate atmospheric phenomenon from global warming. Global warming is driven primarily by greenhouse gases trapping infrared radiation closer to Earth's surface, and the small amount of additional energy associated with the ozone hole is far too limited in scale to meaningfully explain the observed pattern of global temperature rise.

Global volcanic CO2 emissions average roughly 0.15 to 0.26 billion metric tons per year, while human fossil fuel burning and cement production emit about 37 billion metric tons per year, making human output more than a hundred times larger.