Romania and Bulgaria signed the European Union’s Treaty of Accession, the last step to joining the Union.
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The Paris Agreement was opened for signatures.
The United Kingdom left the European Union, also known as 'Brexit.'
Following a ban on exporting beef products from the UK, the government announced that the ban on beef on the bone would be lifted.
The European Union's climate service declared that 2023 was the hottest year on record.
The EU banned all British beef exports due to the risks of carrying 'mad cow disease.'