English to Russian Science Environment & Ecology

When using the default method, Parties are required to use time series of equal length for all disturbance types considered.
If including years after the period 1990-2009 the Party should take care to ensure that this does not cause inconsistencies related to *policy assumptions* (prior to December 2009) applied in the construction of the FMRL (see Section 2.7.5).
For rare events (such as volcanic eruptions), the emissions in all the years in the calibration period may be zero, if the rare event has not occurred in that period.