[R] masked by GlobalEnv ???

[Jhope]

Hi R Listers, 

I am trying to upload a data file and I received this message. It seems that
I am still able to make graphs and Aeventexhumed still works in the
analysis. Can I ignore this message or do I need to do something about this? 

Jean

> require(plyr)
Loading required package: plyr
> turtlehatch <- read.csv(file.choose())
> attach(turtlehatch)
The following object(s) are masked _by_ '.GlobalEnv':

    Aeventexhumed, DeadHatch, ExDate, Hatchlings, MaxHatch, Oldeggs,
Quadrat,
    QuadratEvent, ST0, ST1, ST2, ST3, ST4, Sector, Shells, TotalEggs

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