Answer:
✓More than a hundred million e-mails are sent around the world each day, and they are all vulnerable to interception.
✓Other attacks include the use of viruses and Trojan horses.
✓Only a small fraction of the information flowing around the world is securely encrypted. :)
Answer:
Climate change is a long-term change in the statistical distribution of climate factors. This can be a change in average climatic elements or a change in the distribution of climatic events with respect to average values, or the occurrence of more and more extreme weather events. The very concept of climate change is increasingly related to human impact on the climate, especially the Earth's atmosphere, and therefore climate change is increasingly related to the concept of global warming.
There is a growing debate on how to reduce the human impact on the climate and how to adapt to the changes that are already occurring, and how we can predict future climate change. The biggest concern about human impact on the climate relates to the increased presence of carbon dioxide (CO2) in the atmosphere, due to the consumption of fossil fuels and the increasing amount of solid particles in the air. In addition, there are increasing concerns about ozone holes, increasing deforestation and increasing arable land, which also affects climatic factors.
Look over each of the choices, and plug in each answer to see which one makes more sense, or rather, adds understanding to what you are reading. Start from the bottom. Adding 'and' does little in the way of allowing the reader to understand better. The same can be said for explaining what a tax burden is. By stating the 'therefore', you are saying that what comes after is a factual statement. Adding 'however' is the only answer that improves the relationship between the two ideas.
