Найдите в тексте предложения с Passive Voice, выпишите их, подчеркнув компоненты Passive. Напишите общую формулу Passive Voice. Переведите эти предложения. The term climate change is used to refer to changes in the Earth's climate. In the most general sense, it can be taken to mean changes over all timescales and in all of the components of climate, including precipitation and clouds as well as temperature. Climate changes can be caused both by natural forces and by human activities. However in recent usage, especially in the context of environmental policy, it refers more specifically to changes being studied in the present, including an average rise in surface temperature, or global warming. International efforts to study and address climate change are coordinated through the United Nations Framework Convention on Climate Change. Note, however, that the UNFCCC defines "climate change" as anthropogenic and uses "climate variation" to mean what is used by most other sources to be "climate change". Sometimes the term "anthropogenic climate change" is used to indicate the presumption of human influence. For information on climate measurements over various periods, and the data sources available, see historical temperature record. For attribution of climate change over the past century, see attribution of recent climate change. For global warming episodes in the geological record, see Permian-Triassic extinction event and Paleocene-Eocene Thermal Maximum. Climate changes due to internal factors and external factors. Internal factors are those due to interactions within the earth's climate system. External factors, called climate forcings, are divided into natural factors, such as variations in solar radiation, and anthropogenic factors (those attributed to human activities). There is general agreement among scientists (as revealed by the scientific literature) that: • The 100 kyr ice age cycles are controlled by orbital forcing - variations in the seasonal and geographical distribution of insolation; and in the total insolation. • The rapid temperature changes seen in ice cores during the last glacial were probably caused by events associated with the Laurentide ice sheet and thus count as "internal variability". The Little Ice Age was probably caused by solar variation or volcanic activity. It is known that the weather is a chaotic non-linear dynamical system. It is not clear that the climate (the average of weather) is such a system. Restricting ourselves to the last 400 kyr, the ice core record shows that the largest swings in climate are periodic, with the same periodicity as various orbital variations. These are thus non-chaotic. However, there are large short-term changes which do seem to be best explained as chaotic. Those variations do not seem to occur in the current climate state. Thus, it is possible that the climate system varies between chaotic and non-chaotic, depending on the state of the external forcing. The influence of external factors can be compared using the concept of radiative forcing. A positive radiative forcing warms the planet, and negative radiative forcing cools the planet.