Police revealed 1,065 people had been arrested in connection with the demonstrations and 53 charged.
"Extinction Rebellion", the group behind the protests, called for non-violent civil disobedience to force the British government to reduce net greenhouse gas emissions to zero by 2025 and stop what it calls a global climate crisis.
Earlier on Sunday, in what the group later said was an internal memo meant to garner feedback from members, Farhana Yamin, the group's political circle co-ordinator, said they would shift tactics to "focus on political demands".
In an update on their website Monday, Extinction Rebellion said the protests would enter a new phase in their second week.
Protests calling for the UK Government to declare a climate emergency are set to enter a second week after almost 1,000 people were arrested during the first seven days of Extinction Rebellion demonstrations.
They have led to more than 1,000 arrests in more than a week of protests.
Extinction Rebellion organisers retreated by Monday to Marble Arch - a monument on the edge of Hyde Park that allows limited protests to continue without disrupting traffic.
I can't remember the last time there was so much national debate about climate change, which for me pretty conclusively vindicates their actions in the face of any criticism they might face for inconveniencing commuters or absorbing large amounts of police resource: remember they aren't just trying to get the attention of politicians, but of the millions of voters to whom they are accountable.More news: Annual study finds that Phoenix's air quality is deteriorating
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"It simply isn't right to put Londoners' safety at risk like this".
The 16-year-old spoke at a rally in Marble Arch before a week in which she is scheduled to meet Environment Secretary Michael Gove, Labour leader Jeremy Corbyn and Green Party MP Caroline Lucas.
The schoolgirl has already met the Pope and addressed the European parliament.
Her activism began last August when, prompted by a heatwave and wildfires in Sweden, she began a solitary vigil outside the nation's parliament in Stockholm.
Thunberg, 16, who led the worldwide school strikes for climate action, spoke to the thousands of protesters at Marble Arch.
She continued: "Humanity is now standing at a crossroads".