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Establishing the importance of the topic:
One of the most significant current discussions in legal and moral philosophy is ......
It is becoming increasingly difficult to ignore the .....
X is the leading cause of death in western industrialised countries.
X is a common disorder characterised by ......
X is an important component in the climate system, and plays a key role in Y.
In the new global economy, X has become a central issue for ......
In the history of development economics, X has been thought of as a key factor in ....... 
Xs are one of the most widely used groups of antibacterial agents and ......
Xs are the most potent anti-inflammatory agents known.
X is a major public health problem, and the cause of about 4% of the global burden of disease.
X is an increasingly important area in applied linguistics. 
Central to the entire discipline of X is the concept of ....... 
X is at the heart of our understanding of ......
Establishing the importance of the topic (time frame given):
Recent developments in X have heightened the need for ......
In recent years, there has been an increasing interest in ......
Recent developments in the field of X have led to a renewed interest in ......
Recently, researchers have shown an increased interest in ......
The past decade has seen the rapid development of X in many .......
The past thirty years have seen increasingly rapid advances in the field of......
Over the past century there has been a dramatic increase in ......
One of the most important events of the 1970s was ......
Traditionally, Xs have subscribed to the belief that ......
X proved an important literary genre in the early Y community.
The changes experienced by Xs over the past decade remain unprecedented.
Xs are one of the most widely used groups of antibacterial agents and have been extensively used for decades to ....... 
Highlighting a problem in the field of study:
However, these rapid changes are havin