Top global scientists are at their wits' end on how to make world leaders realize that the Earth is on the brink of a climate catastrophe if they do not cooperate in cutting down their gas emissions before mid-century.

Despite the agreement  entered among nations last 2009 to put a stop to global warming by limiting the rise in temperature of the Earth's climate system, efforts have not been enough to arrest the continuing rise of mean temperature.

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Latest reports from the UN Intergovernmental Panel on Climate Change (IPCC), presented at a meeting in Berlin, said there is still time for these countries to avert the impending catastrophe if only they will aggressively decrease the concentration of greenhouse gases produced by human activities such as carbon dioxide emissions from fossil fuel, cement production and deforestation.

The report further pointed out that the 2009 agreement can still be fulfilled for as long as the countries decrease their use of coal and instead use clean energy sources like wind and solar power.

To bring down global temperatures to just 2 degrees Celsius or 3.6 degrees Fahrenheit above pre-industrial levels, which was the target set by these nations, emissions must be lowered by "40 to 70 percent" of the 2010 levels, the report said.

The IPCC report warned global leaders of the imminent danger countries worldwide will  face if collective and definitive actions to combat global warming are not made before 2050.

The scientists said among the grim consequences nations face by the end of the century are higher flood levels, frequent and prolonged snowstorms, and rapidly melting ice caps.

The climate change meeting was marred by disagreements between the representatives of developed and developing countries, and scientists are frustrated and somewhat skeptical if the goals they set in the report will be reached.

The week-long conference started and ended in a blaming game, with developed countries pointing to the other as relying heavily on coal to power up their expanding economies, while the developing countries pointed to the US and China as the world's biggest polluters.

The report challenged the developing nations to shoulder the responsibility of keeping the planet clean and safe amid their continuing rise of coal use.

Countries such as India, Brazil and South America heavily rely on coal use, making them one of the major gas emitters worldwide.

"As developing nations grew, greenhouse gas emissions increased more between 2000 and 2010 than in each of the previous three decades, the report said."