Based on the article, several key points can be identified regarding the submissions of NDCs (National Determination Contributions) by various countries at COP29:

Brazil's Submission: Brazil has announced a range of climate targets which goes from reasonable to insufficient. They are aiming for reducing greenhouse gas emissions by 59-67% below 2005 levels by 2035. This is seen as falling short of what is necessary to achieve the goal of achieving 'climate neutrality' by 2050.

UAE's Submission: The UAE has set a target of reducing its net zero carbon emissions by this year, and their NDC3 sets a target of 47% reduction in greenhouse gas emissions by 2035 compared to 2019 levels.

UK's Submission: The UK announced it's vision for 2035 – a goal to reduce all greenhouse gas pollution by at least 81 percent from 1990 levels, which is ambitious and will unlock business-led investment in clean energy.

Need for Developed Countries' Collective Ambition: Developed nations need to demonstrate early peaking of global emissions and set NDCs that can compensate for the emission gap, according to experts like Manish Kumar Shrivastava from The Energy and Resources Institute.

Urgency in Addressing Emissions Gap: Experts like Inger Andersen, the UNEP Executive Director, view these submissions as our last chance to avoid overshooting 1.5°C, emphasizing the need for collective ambition in addressing greenhouse gas emissions.

Phasing Out Fossil Fuels: There is a push for immediate action towards ending new coal approvals and phasing out all fossil fuels by mid-century.