To varying degrees, the member nations, all large wealthy democracies, will be looking to create a united front on tackling the world’s biggest issues. That unity was notably lacking under President Donald J. Trump, who disdained traditional allies and alliances, opposed efforts to fight global warming, was protectionist on trade, wanted a harder stance on China than the other members and wanted to go easier on Russia.

Now, under Mr. Biden, the biggest and most powerful member of the club has moved back toward consensus positions, though conflicts remain. He has rejoined the Paris climate agreement, European and American negotiators are close to resolving trade and tariff disputes, and the G7 nations — the United States, Germany, Japan, France, Italy, Canada and Britain, this year’s host country — and the European Union have made major commitments to increasing supplies of coronavirus vaccines to developing countries.

The G7 meeting began on Friday, though much of the day was spent in formalities like a reception and dinner with Queen Elizabeth II and other members of Britain’s royal family. In addition to the seven national leaders, by tradition the top European Union officials, Ursula von der Leyen and Charles Michel, are also taking part.

The host country can invite other countries and international organizations to take part as guests, and some of this year’s sessions will include the leaders of India, South Korea, South Africa and Australia, as well as Secretary-General António Guterres of the United Nations. Prime Minister Narendra Modi of India is expected to take part remotely.

Melinda French Gates, a co-chair of the Gates Foundation, and Patrick Vallance, the British government’s chief science adviser, are expected to address the health session virtually.

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