How ‘Shared Socioeconomic Pathways’ Explore Future Climate Change

Over the past few years, an international team of climate scientists, economists and energy systems modellers have built a range of new “pathways” that examine how global society, demographics and economics might change over the next century. They are collectively known as the “Shared Socioeconomic Pathways” (SSPs).

Analysis: Why Scientists Think 100% of Global Warming is Due to Humans

The extent of the human contribution to modern global warming is a hotly debated topic in political circles, particularly in the US.During a recent congressional hearing, Rick Perry, the US energy secretary, remarked that “to stand up and say that 100% of global warming is because of human activity, I think on its face, is just indefensible”. However, the science on the human contribution to modern warming is quite clear. Humans emissions and activities have caused around 100% of the warming observed since 1950, according to the Intergovernmental Panel on Climate Change’s (IPCC) fifth assessment report.

Interpreting the Paris Agreement’s 1.5C Temperature Limit

In a commentary paper for the journal Geophysical Research Letters, we show that the temperature limits in the Paris Agreement should be understood as changes in long-term global averages attributed to human activity, which exclude natural variability. This means 1.5C might be breached in individual years well before the global long-term 1.5C temperature limit has definitively been crossed.

IPCC Climate Change 2014: Impacts, Adaptation, and Vulnerability – headlines

•Panel’s Warning on Climate Risk: Worst Is Yet to Come •Conservative Climate Panel Warns World Faces ‘Breakdown Of Food Systems’ And More Violent Conflict •Big impacts: The main messages from today’s big UN climate report