The 12-day technical talks are focused on hammering out an "operating manual" for the landmark 2015 Paris climate pact, which calls for capping global warming at "well below" two degrees Celsius (3.6 degrees Fahrenheit), and 1.5C if possible.
Twelve-year-old Timoci Naulusala from Fiji, a nation disappearing under rising seas, was delivering a testimonial to ministers and heads of state with crisp English and irresistible charm.
Five months after the world's most famous climate sceptic said he would yank the United States out of the 196-nation Paris Agreement, the diplomats and leaders tasked with implementing it remained both defiant and concerned.
Decked out in red to signify their "Stop Coal" campaign, the protesters chanted and beat drums as they snaked through the former West Germany capital toward the UN centre that will host the 12-day, 196-nation talks, tasked with implementing the landmark Paris Agreement.
On the campaign trail, now-president Donald Trump vowed to "cancel" the 196-nation pact to rein in global warming by curbing emissions from burning oil, coal and gas.
City temperatures are forecast to shoot up in the coming years, exposing inhabitants to killer heat spikes, while rising sea levels and river flooding threaten homes, drinking water, and transport and electricity infrastructure.
The group, Earthlife Africa, successfully challenged a government decision to confirm construction of a proposed coal-fired power station, arguing that the proper climate change impact assessment had not been carried out.
Moroccan foreign minister Salaheddine Mezouar put on a brave face as the talks hit the half-way point, saying they remained on track for the arrival next week of some 60 heads of state.
In an assessment coinciding with the UN climate talks in Morocco, the Paris-based Institute for Sustainable Development and International Relations (IDDRI) gave the EU high marks in some areas.
In an exclusive interview, Ebtekar said Iran had already seen temperatures rise by 1.5 degrees over the past 20 years, and urgently needed to work with international partners.
Bangladesh has been one of the worst victims of global warming, with thousands of people being killed by cyclones in recent years that have become more frequent and deadlier.
It called for a "broad-based transformation of food and agricultural systems" to adapt to a warmer world, with an emphasis on supporting small shareholders.