Many of the issues the world faces today are global and go beyond the scope of national laws, e.g. national governments cannot tackle climate change alone or coordinate the response to a global disease epidemic
Political and legal organisations that exist to pass and enforce laws, decide whether a law has been broken, or act as a forum for different groups to discuss issues and sort out their differences
Global governance regulates the global economic and political system by setting up rules countries and companies should follow, monitoring whether they follow the rules, and enforcing the rules if they aren't followed
The laws and norms that international institutions enforce mean that countries must abide by common rules, giving greater stability because countries know how other countries are likely to react to a situation, making conflict less likely
Countries sign up to international laws and institutions voluntarily - if a country doesn't sign or formally approve a particular treaty, then they are not bound by the laws that the treaty sets out
It can also be difficult to make countries and Transnational Corporations (TNCs) comply with the rules, e.g. in 2016, China ignored a court ruling that its claims over the South China Sea went against international law
Some people think that global institutions act for political reasons, e.g. it is alleged that some countries have used the International Criminal Court to remove people they don't want in power in African nations
Conditional loans from the IMF or World Bank, where less developed countries have to implement free trade policies and cut government spending (often on education and health care) in order to receive the loans
Developed countries hold the main power over decisions taken at the UN, and many of the global issues tackled by the UN affect African countries the most, e.g. refugee crises, but no African country has a permanent seat on the UN Security Council
The UN has been ineffective at times, e.g. in 1995, UN peacekeepers failed to protect 8000 people in Srebrenica in south-east Europe when they were massacred by Bosnian Serbs
Decisions made by global institutions affect institutions at the international, national, regional and local scale, e.g. the 2015 Paris climate change agreement required changes in policies at all levels
Decisions at the local or regional level can affect institutions at the global level, e.g. in 2016 a regional government in Wallonia, Belgium temporarily blocked a trade deal between the EU and Canada