20152017

20152017 refers to the period spanning 2015 through 2017, a window of time characterized by rapid changes in politics, economics, technology, and society worldwide.

Politics and global affairs: The Paris Agreement on climate change was adopted at COP21 in 2015 and entered into force in 2016, shaping climate policy for many nations. In 2016, the United Kingdom voted to leave the European Union in the Brexit referendum, triggering long-term renegotiations of trade and border policies. In 2017, the Catalan independence referendum and subsequent political crisis tested Spain's constitutional framework. The 2016 U.S. presidential election brought a new administration with shifted foreign and domestic priorities.

Economy and markets: The period included a supply glut and price volatility in energy markets, with oil prices depressed through much of 2015–2016. Global growth was uneven, with emerging markets facing capital flow volatility and developed economies adjusting to monetary policy changes.

Social issues and security: The European migrant crisis continued to affect European politics and humanitarian responses. The Zika virus outbreak (2015–2016) prompted public health campaigns and research. A string of major terrorist attacks in 2015–2017 influenced security policy and public life.

Science, technology, and culture: Advances in biotechnology and information technology continued, with wider public awareness of data privacy and cybersecurity. The year 2016 hosted the Summer Olympics in Rio de Janeiro, and 2017 saw significant cybersecurity incidents such as the WannaCry ransomware attack and major data breaches.