Pecker is a key witness in the case against the former US president, who is accused of falsifying business records to cover up hush-money payment
But that is "not something to celebrate", said Mathis Wackernagel, president of Global Footprint Network, in an online presentation.
"It's not done by design, it's done by disaster," he added.
Researchers calculate the date humanity overshoots its planetary budget by looking at "all the human demands" for food, energy, space for houses and roads and what would be needed to absorb global C02 emissions, Wackernagel said.
Comparing that with what is sustainably available, they estimate that humanity is using 60 per cent more than can be renewed - the equivalent of 1.6 planets.
"It's like with money. We can spend more than what we earned, but not forever," said Wackernagel.
The study estimated that the pandemic had driven a 14.5 per cent decrease in humanity's carbon footprint compared to 2019, while forest products saw an 8.4 per cent fall, largely because of smaller harvests anticipating poor demand.
Researchers said that the pandemic had caused huge disruption to global agricultural systems and markets, but concluded that ultimately there was little change to the scale of humanity's food footprint.
Global Footprint Network has said that efforts to control the pandemic show that changing consumption habits in a short time frame is possible, adding that the overshoot date is "an unprecedented opportunity to reflect on the future we want".
Speaking at the launch presentation Marco Lambertini, the head of WWF International, said the pandemic had hit the vulnerable hardest and brought into focus "our unsustainable, wasteful, destructive frankly, relationship with nature".
He called for a "decoupling" of economic development from environmental degradation.
"We can develop, but not at the expense of the planet because we know that the planet in crisis is a society in crisis, and an economy in crisis," he added.
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