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Global warming is the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) due to human activities, primarily fossil fuel burning, which increases heat-trapping greenhouse gas levels in Earth's atmosphere.

Earth has warmed and cooled time and again. Climate has changed when the planet received more or less sunlight due to subtle shifts in its orbit, as the atmosphere or surface changed, or when the Sun’s energy varied. But in the past century, another force has started to influence Earth’s climate: humanity
How does this warming compare to previous changes in Earth’s climate? How can we be certain that human-released greenhouse gases are causing warming? How much more will the Earth warm? How will Earth respond? Answering these questions is perhaps the most significant scientific challenge of our time.
What is Global Warming?
Global warming is the unusually rapid increase in Earth’s average surface temperature over the past century primarily due to the greenhouse gases released as people burn fossil fuels. The global average surface temperature rose 0.6 to 0.9 degrees Celsius (1.1 to 1.6° F) between 1906 and 2005, and the rate of temperature increase has nearly doubled in the last 50 years.

 
President Trump's "America First" strategy of the last four years had increased tensions between the United States and the rest of the world, specifically China. It was already leading to friction in the smooth supply-and-demand economic chain that has been the hallmark of an interdependent global world. But the self-isolation during the pandemic could mean the end of globalization as we know it.
Some people worry that this moment is strengthening the hand of nationalism that was rising before the pandemic and that it is accelerating the changing relationships between countries.

The incidence of dengue has grown dramatically around the world in recent decades. A vast majority of cases are asymptomatic or mild and self-managed, and hence the actual numbers of dengue cases are under-reported. Many cases are also misdiagnosed as other febrile illnesses [1].
One modelling estimate indicates 390 million dengue virus infections per year (95% credible interval 284–528 million), of which 96 million (67–136 million) manifest clinically (with any severity of disease) [2]. Another study on the prevalence of dengue estimates that 3.9 billion people are at risk of infection with dengue viruses. Despite a risk of infection existing in 129 countries [3], 70% of the actual burden is in Asia [2].
The number of dengue cases reported to WHO increased over 8 fold over the last two decades, from 505,430 cases in 2000, to over 2.4 million in 2010, and 4.2 million in 2019. Reported deaths between the year 2000 and 2015 increased from 960 to 4032.



This alarming increase in case numbers is partly explained by a change in national practices to record and report dengue to the Ministries of Health, and to the WHO. But it also represents government recognition of the burden, and therefore the pertinence to report dengue disease burden. Therefore, although the full global burden of the disease is uncertain, this observed growth only brings us closer to a more accurate estimate of the full extent of the burden.

Global education helps
students develop their capacity to be informed, open-minded, and responsible people, who are responsive to diverse perspectives. Global education prepares us to address the world’s most pressing issues collaboratively, equitably, and sustainably. Global education helps students understand that pressing issues must be faced in an interdisciplinary way, given the complexity of environments and competing needs and interests.
 
The primary aim of Global Citizenship: Education (GCED)  is nurturing respect for all, building a sense of belonging to a common humanity, and helping learners become responsible and active global citizens. GCED aims to empower learners to assume active roles to face and resolve global challenges and to become proactive contributors to a more peaceful, tolerant, inclusive, and secure world. Education for global citizenship helps young people develop the core competencies which allow them to actively engage with the world and help make it a more just and sustainable place. It is a form of civic learning that involves students’ active participation in projects that address global issues of a social, political, economic, or environmental nature.

Global Education
Global education helps students develop their capacity to be informed, open-minded, and responsible people who are responsive to diverse perspectives. Global education prepares us to address the world’s most pressing issues collaboratively, equitably, and sustainably. Global education helps students understand that pressing issues must be faced in an interdisciplinary way, given the complexity of environments and competing needs and interests.
Through global education, students will prepare to thrive and lead change in an interconnected world. Students will engage in dimensions of cultural diversity to reach common understandings and goals. Through a stronger awareness of global issues, students will be able to address today’s greatest challenges and make a difference in the world, both collaboratively and equitably.

Estimating and analyzing the Earth Energy Imbalance (EEI) is essential for understanding the evolution of the Earth’s climate. This is possible only through a careful computation and monitoring of the climate-energy budget. The climate system exchanges energy with outer space at the top of the atmosphere (TOA) (through radiation) and with solid Earth at the Earth’s crust surface (essentially through geothermal flux). If the climate system were free from external perturbations and internal variability during millennia, then the climate-energy budget would be in a steady state in which the net TOA radiation budget compensates the geothermal flux of +0.08 Wm–2 (Davies and Davies, 2010).
But the climate system is not free from external perturbations and from internal variability. Although the geothermal flux does not generate any perturbations at interannual to millennial time scales (because it varies only at geological time scales), other external forcings from natural origin (such as the solar radiation, the volcanic activity) or anthropogenic origin (such as Greenhouse Gas emissions –GHG-) perturb the system.
 
REf:https://www.frontiersin.org/articles/10.3389/fmars.2019.00432/full

It's what people are being asked to tell each other. Less than 10 days ago, London banned people who live in different households from meeting each other indoors, to stop the spread of the coronavirus.
 
"Nobody wants to see more restrictions, but this is deemed to be necessary in order to protect Londoners' lives," London Mayor Sadiq Khan told the London Assembly.
 
Taking away the welcome mat is key to cutting off the path of the coronavirus. From the beginning of the pandemic, cities, states, and countries have banned each other. And now, eight months into lockdowns that have led to immense stress and fatigue among people, some places around the world are introducing even more draconian measures.24 
The path toward recovery continues to be inherently antisocial and runs counter to how humans interact, live lives, and conduct their business. This unwelcome policy — which has already harmed families, societies, and economies — has the potential to lead to a tectonic shift in how the world functions in the foreseeable future.